Seresto Reviews | The Complete Guide (Including Side Effects)

We did plenty of research before completing our review of Seresto Dog Collars. In particular, we wanted to make sure this is a safe product before recommending it to our readers.

Quick Stats

Seresto Flea & Tick Dog Collar

  • Suitable for dogs 7 weeks or older
  • Killsfleas and ticks
  • Prevents flea eggs from hatching, interrupting the life cycle
  • Water resistant
  • 8 months protection
  • Delving into the research we found that over 20,000 reviewers from leading online retailers gave Seresto Collars and average of 3.8 stars, for something as important as flea and tick control this could be of some concern.

    We did find some anecdotal reports from some folks online about the safety of this product, however, we also found similar reports for other pesticide-based flea and tick control products.

    Dr Sara Redding Ochoa | Doctor Of Veterinary Medicine

    Sara is Wileypup’s Veterinarian Adviser and helped compose this article to ensure the information is up to date and accurate. For more information on Sara click here

    Want to know the truth?

    A small number of dogs can have hypersensitivity to certain chemicals, and pesticides are known to sometimes trigger extreme reactions.

    Instead of deciding for you if Seresto Collars are safe, we tried to present some resources and information that you can trust so that you can make the right decision along with your vet for what is going to work best for you and your dog.

    We did, however, find lots of confirming evidence from customers, veterinarians and independent research studies that the product is effective.

    On this score, unless your particular geographic area has already developed resistance to this product, Seresto Flea and Tick Collars are very likely to be an effective way to treat fleas and ticks on your dog.

    Want to see Seresto shapes up against some of their biggest competitors? Check out our below guides:

    Frontline vs Nexgard.

    Seresto For Dogs | Why is Flea and Tick Treatment Important for my Dog?


    You may have heard of Lyme Disease or Rocky Mountain Spotted Fever. Depending on where you live, these tick-borne illnesses may even be common, particularly for people or dogs that spend significant amounts of time outdoors.

    However, there are actually many tick borne diseases throughout the country, a full list of which you can find here.

    It is untrue that there are areas in the United States that do not have ticks.

    This distribution map published by the Centers for Disease Control and Prevention, shows that every state does have at least one species of tick.

    However, some more specific environments, such as urban spaces, likely have less chance of encounters with ticks than thick woodsy environments where ticks are more common.


    Fleas are also vectors for a few nasty conditions that can affect your dog. Many canines are sensitive to their bite, causing scratching at the site of the bite and in some cases excessive licking and biting which can lead to “Hot Spots.”

    These are patches where your dog has licked away the fur. They are painful for your dog and can also be persistent and difficult to treat.

    Fleas can also carry tapeworms, a nasty parasitethat can also spread to humans.

    Although rare, fleas can also pass on “Cat Scratch Disease,” Bartonella, and Maurine Typhus, very serious diseases that pose a threat to human health.

    Fleas also pose the potential threat of infesting your home.

    Once established in carpets, furniture and bedding, fleas can be extremely difficult to irradiate, sometimes requiring professional extermination.

    By properly treating your dog, you can prevent the primary means that fleas will enter your house, stopping them before they have a chance to take root.

    Safety Precautions When Using Flea and Tick Dog Collars

    • Never combine flea and tick treatments since this can cause an overdose of medication
    • Never use products designed for cats on dogs, or vice versa
    • Always carefully follow the manufacturer’s instructions for use
    • Keep children from touching or playing with medicated collars
    • Wash your hands after fitting or touching the collar
    • Stop use immediately and call a vet if your dog shows any concerning symptoms

    Are Seresto Collars Safe?

    When we started our research for Seresto Collars, we did find reports from customers with safety concerns about this product. It is important to note that ALL products that use pesticides to kill fleas and ticks have similar customer complaints associated with them.

    Anecdotal reports are hard to verify, may be related to something other than the product, and are not the same as scientific research on the safety of a product.

    Note that for example, a very popular product, such as Seresto Collars, is going to be used by millions of dog owners.

    Even if a tiny fraction of these owners have a problem, it is likely to show up on the internet.

    Since it is impossible to assess the frequency of problems from such anecdotal reports, it is also impossible to call a product unsafe strictly on those accounts.

    Still, we saw enough reports that we wanted to give our readers some resources to learn about potential problems with this product, so that you can talk to your vet and decide if this is the right product for flea and tick control.

    If you decide it is, we have linked the two collars now available on the market so you can be sure to get it in the right size. Click HERE to jump to that review.

    If you decide you want to try some other products to see if they provide flea and tick protection without the risk of pesticide-based formulas, click HERE to learn about some alternative products that may be what you are looking for.

    Veterinarian Perspectives

    In some cases, veterinarians have raised concerns about the safety of Seresto flea and tick collars, others have deemed the product safe.

    Here are a few references to read if you are interested in the advice of some professional veterinarians:

    National Pesticide Information Center

    A helpful resource for dog owners, provided by a partnership between the EPA and Oregon State University is the National Pesticide Information Center.

    This organization sponsors an information phone hotline for consumers to call and get the most up-to-date information on pesticides of all kinds, including topical flea and tick treatments used for domestic pets.

    The helpline is available Monday – Friday, 8:00 AM – 12:00 PM, Pacific Time. The number is 1-800-858-7378.

    Environmental Protection Agency (EPA)

    The EPA released this report in 2016. Their conclusion is that Seresto collars are safe for pets wearing these flea and tick collars.

    They do, however, recommend that children should not play with the collars, and should be quarantined from the pet during the first day that they are wearing the collar to minimize exposure to the child.

    This report also mentions that the EPA has received reports of adverse effects in pets and promises further evaluation.

    Interestingly, the EPA did evaluate another pesticide in 2014 that was used in flea and tick collars called, propoxur. They noted that there were unacceptable risks to children in the first day of application.

    Sergeant's and Wellmark were the two companies that were selling these collars, and they subsequently voluntarily pulled them from the market.  

    U.S. Food and Drug Administration

    Although the regulation of topical flea and tick products is the jurisdiction of the EPA, there is also some general oversight provided by the FDA for these types of medications. You can find the Seresto registrations with the FDA here and here.

    In addition, some helpful information on the use of external flea and tick products can be found here

    Included in this document are important helpline numbers for reporting incidents of negative reactions from the use of these products.

    Seresto Dog Collar Customer Reviews 

    Seresto dog collar customer reviews on Amazon show that this is the most popular flea and tick collar on the market.

    With nearly 10,000 customer reviews, the Seresto collar for large dogs gets a 3.9 star rating, with over 60% of customers giving it 5 stars.

    Among the near 20% of customers that gave it one star, about half reported that the collar was ineffective. Note that sometimes fleas and ticks develop regional resistance to pesticides, which may account for some of these complaints.

    The other half of the significant number of one-star reviews mentioned health problems and side effects from using this product.

    Although rashes, lethargy and loss of appetite were the most common symptoms noted by unhappy customers, a few of the reviews documented extreme adverse reactions, including seizures and neurological problems.

    At least 15 of the customer reviews sadly reported that their dog died shortly after use of this product.

    To contrast this data with the next most popular flea and tick dog collar, the Hartz Ultra Guard Plus, only 34% of customers gave this collar a 5 star rating.

    42% gave it a one-star rating. The reasons for negative reviews were overwhelmingly about ineffectiveness for flea and tick prevention.

    Among the 104 one-star reviews, six customers complained the product made their dog sick, and none reported death.

    Seresto Collar Side Effects

    Unfortunately, the product label for these flea and tick collars does not include potential side effects. Bayer has also failed to be transparent about potential side effects on their website.

    The instructional leaflet that comes with the product does mention “Slight hair loss and mild skin reactions due to the mechanical irritation of the collar may occur at the application site which usually recover within 1 or 2 weeks without the need for collar removal.”

    The leaflet also warns to keep the collar out of the reach of children, and to not let them play with the collar.

    However, we can learn more by looking at the active ingredients, flumethrin and Imidacloprid.

    Symptoms of toxicity with Flumethrin:

    • Ataxia (loss of muscle coordination)
    • Hyperreactivity (behavioral changes)
    • Tremors
    • Skin tingling
    • Extreme lethargy
    • Drooling
    • Vomiting
    • Diarrhea
    • Incontinence

    Symptoms of toxicity with Imidacloprid:

    • Rash
    • Fatigue
    • Twitching
    • Cramps
    • Muscle weakness
    • Difficulty breathing

    Both of the active ingredients have raised environmental concerns about their impact on bees, birds and aquatic life.

    If your dog starts showing any of these symptoms after using a Seresto collar or any other product containing pesticides, immediately take it off and wash your dog with a mild detergent and plenty of water.

    Call your vet to talk and make an appointment so they can do a proper evaluation and diagnosis as well as recommend alternative treatments if necessary.

    My Dog Ate a Seresto Collar!

    If you suspect your dog has eaten all or part of a Seresto or any other medicated flea and tick collar, take them to the veterinarian right away.

    If your vet is unavailable due to a holiday, call the APSCA Poison Control Center Hotline at (888) 426-4435.

    All Flea and Tick Pesticides Can Trigger Potentially Severe Symptoms

    Some veterinarians have pointed out that there are potential adverse side effects with all pesticide-based medications used for flea and tick prevention including collars, drops, pills, shampoos and sprays.

    For example, Dr. Deva Khalsa points out that the active ingredients in several flea and tick treatments have been implicated in a variety of health problems, including thyroid cancer, kidney toxicity, nervous system issues, extreme lethargy and seizures.

    It is critical to work with your vet to find the right product for you and your dog.

    Since flea and tick-borne illness are also potentially deadly to your dog, you will need to weigh the risks and benefits with your veterinarian.

    Do Seresto Collars Work?

    With the exception of some regions where fleas and ticks may be resistant to the active ingredients, there is plenty of evidence to suggest Seresto collars provide an effective treatment for these external parasites.

    Your veterinarian can confirm if the product is working well in your area.

    • When compared to other flea and tick collars by average customer reviews, Seresto collars seem to be significantly more effective than other dog collars on the market that we reviewed.
    • As we indicated above in our summary of customer reviews, the vast majority of customers of this extremely popular flea and tick collar for dogs rated Seresto collars as effective to very effective.
    • Independent research studies have also confirmed that Seresto collars provide effective treatment for fleas and ticks. See(Stanneck et al., 2012) and (Brianti et al., 2013) for more information.

    Seresto Collar Reviews

    Benefits of Seresto Dog Collars

    Despite some concerns noted above about the safety of this product, the fact is that thousands of pet owners have used this collar with no ill effects. In fact, many pet parents have found it to be very effective in the treatment of fleas and ticks.

    Here are some other benefits of using this collar over other flea and tick products:

    • Single application will yield 5-8 months of protection
    • Customer reviews consistently mention it is very effective
    • Low odor after the first few days
    • Non-greasy
    • Kills fleas and ticks on contact, without the need to bite your dog to be effective
    • Water resistant, safe for bathing and swimming
    • Also kills lice and can be effective in the treatment of sarcoptic mange

    If you decide that the possible risks of Seresto collars are outweighed by it’s effectiveness in preventing the dangers presented by fleas and ticks in your region, you can buy this product in two sizes:

    • For dogs weighing up to 18 pounds
    • For dogs weighing over 18 pounds

    Flea and Tick Collar Alternatives to Seresto

    Hartz Ultraguard Plus Flea &Tick Dog Collar

    As we mentioned above, there are adverse side effects that are possible for all pesticide-based dog collars. Pesticides are, after all, poison.

    However, if you have decided that Seresto is not the product you feel comfortable using, but still want the protection of a medicated dog collar, this is an alternative.

    Active Ingredients:

    • Tetrachlorvinphos – 14.55%
    • (S) Methoprene – 1.02%
    • Up to 7 months of protection
    • Kills fleas and ticks
    • Prevents flea eggs from hatching, interrupting the life cycle
    • Water resistant
    • For use in dogs of any size, 12 weeks and older
    • Cuts for adjustable fit to any size dog up to 26”
    • Can take several weeks to stop an infestation
    • Several customers reported this product as ineffective
    • Only has a 3-star overall rating on Amazon

    All-Natural Flea and Tick Products





    Vet’s Best Natural Flea and Tick Spray

    • Eco-friendly
    • Nice smelling product
    • Safe for puppies, 12 weeks and older

    Wondercide Flea and Tick and Mosquito Control Spray for Cats, Dogs and Home

    • Kills and repels fleas, ticks and mosquitos
    • Delicious scent
    • Grease free formula

    Natural Chemistry Flea and Tick Shampoo

    • Pesticide free – safe for use around children
    • Also effective with black flies and mosquitos
    • Eco friendly formula

    After thoroughly reviewing as many products as we could find, Wiley Pup did not identify any all-natural flea and tick collars that seemed to work well enough to recommend to our readers.

    However, we did find several all-natural flea and tick preventatives for dogs that do have a good track record.

    Vet’s Best Natural Flea and Tick Spray

    Active Ingredients:

    • Peppermint Oil – 0.30%
    • Eugenol (Clove Oil Extract) – 0.70%
    • Sodium Lauryl Sulfate – 2.70%
    • Kills and repels fleas and ticks as well as flea eggs
    • Spray directly on your dog or on bedding, furniture or carpets
    • Safe for puppies, 12 weeks and older
    • Eco-friendly
    • Safe for use around children
    • Nice smelling product
    • Made in the USA
    • Pesticide free
    • Extremely popular – almost 5,000 reviews with 66% percent giving 4 stars or better
    • Can cause mild to moderate eye irritation if it gets into you or your dog’s eyes
    • About 15% of customers gave this a one-star rating, noting mostly ineffectiveness or problems with their cats being bothered by the smell
    • If you have a cat in your household, this may not be your best option since both peppermint and clove oil can prompt adverse respiratory and dermal reactions in cats

    Wondercide Flea and Tick and Mosquito Control Spray for Cats, Dogs and Home

    If you have cats in your home, this natural flea and tick repellent is a safe alternative to Seresto collars that will not bother your feline pets. In fact, this can be used on both cats and dogs safely.

    It both kills and repels so you can rely on this product to quickly reduce an infestation in your home. This responsibly sourced and eco-friendly product gets high reviews for effectiveness and one of the most popular products in it’s class

    A little expensive, and requiring frequent reapplication to stay effective, you may want to look at other options if finding a budget friendly option is your top priority.

    Active Ingredients:

    • Cedar Oil – 4.2%
    • Sodium Lauryl Sulfate – 2.2%
    • Lemongrass Oil – 1.5%
    • Sesame Oil – 0.1%

    In addition to the spray, Wondercide also makes insect control spray for the garden, ear wash, shampoo bars, as well as a special detox bentonite clay for the truly pampered pet.

    • Kills and repels fleas, ticks and mosquitos
    • Clove and Peppermint oil free, making it also safe for use around cats
    • Delicious scent
    • Grease free formula
    • Use directly on your pet as well as surfaces in your home
    • Safe around children
    • Eco-friendly
    • Family owned business
    • Human grade ingredients for the highest quality
    • Product is both made and sourced in the USA
    • 68% of customers give this product a 4 star or better rating, citing mostly effectiveness and pleasant smell
    • Pricier than some other’s in its class
    • You will have to reapply fairly often
    • About 15% of customers gave this a one star rating, mostly citing ineffectiveness or the strong smell of the product

    Natural Chemistry Flea and Tick Shampoo

    For some people, a flea and tick shampoo is a better fit than a spray. If you find yourself bathing your dog weekly, you may be better served with a shampoo product.

    This all-natural shampoo receives high marks for effectiveness among most of the customers that reviewed it, along with praises for the lovely smell of cinnamon. In addition, this is a budget friendly solution for flea and tick control.

    Natural Chemistry also makes other popular flea and tick control products, including Yard and Kennel Spraytopical drops, and an oatmeal shampoo formula for dogs with sensitive skin.

    Active Ingredients:

    • Sodium Lauryl Sulfate – 1.20%
    • Cinnamon oil – 0.50%
    • Cedar oil – 0.20%
    • Clove oil – 0.20%
    • Kills and repels fleas and ticks
    • Also effective with black flies and mosquitos
    • Pesticide free – safe for use around children
    • Eco friendly formula
    • Pleasant cinnamon smell
    • Inexpensive, particularly compared to other all-natural flea and tick products
    • 74% of customers rate this product 4 stars or above
    • Clove oil is known to irritate many cats, not a good choice for multiple pet households
    • Reapply after 7 days
    • May not be a great choice for white dogs, since
    • Does not lather as well as some other natural flea and tick dog shampoos
    • 8% of customers gave this product a one star rating, citing mostly unhappiness with the effectiveness against fleas
    • May not be a great choice for white dogs, since
    • May not be a great choice for white dogs, since


    At WileyPup, we want you to have the information that you need to make an informed decision about the products and gear that you choose for your dog.

    Given the importance of flea and tick prevention and treatment, it is critical that you have a conversation with your veterinarian before making a final decision on flea and tick medications.

    However, we wanted to make sure that you had the information you need to make the most of that conversation.

    This Seresto collar review has covered both the pros and cons of these popular flea and tick collars.

    While some consumers have had negative experiences with the product, the vast majority report a safe and effective experience with Seresto dog collars.

    Just in case you decide it is not the product for you and your dog, we wanted you to have some viable alternatives, including flea and tick collars that use other pesticide ingredients as well as some all natural flea and tick control alternatives that some of our readers may find most appropriate for their needs.


    How long does it take for Seresto to start working?

    The Seresto collar becomes fully effective after 24 hours. In 24 hours, it will kill existing fleas and become effective against new infestations. Seresto collars also prevent flea eggs from hatching.

    Is Seresto safe for humans to touch?

    There have not been many reports of Seresto collars causing adverse reactions in humans who touch them. At worst, it’s usually a light skin irritation. However, touching the collar too much is still not recommended, and you should wash your hands in cold water after doing so.

    Do you take the Seresto collar off for baths?

    It’s not necessary to take the Seresto collar off for baths. The collar is water-resistant, and it’s fine if you keep it on for a bath or when your dog goes for a swim. However, if you give your pooch baths very often (more often than once a month), you might want to consider taking the collar off. Frequent baths will not ruin the collar but will shorten the duration of effectiveness.

    Can a dog sleep in bed with a Seresto collar?

    It is safe to let your dog sleep in bed with a Seresto collar. However, direct contact between the collar and your skin and face should always be avoided.

    Sharon Elber (M.S. in Science & Technology) - Professional Dog Trainer

    Sharon is a professional dog trainer with over 10 years experience. She is also a professional writer that received her M.S. in Science & Technology Studies from Virginia Tech.

    For more info on Sharon click here

    1. My dog has been wearing the Seresto collar for about two months and it’s working great, however, she has very bad dandruff and oily fur. Could this be a result of using the collar?

    2. My dogs been wearing the collar for about two months and it works great, however, she has very bad dandruff and oily fur. Could this be the result of wearing the collar?

      1. Hi Diana,

        It’s really hard to say. It sounds like something might be irritating her skin but that could be anything from grass to allergies. Always best to check these things with your vet.

    3. My 3 dogs have been wearing the seresto collar for the past 3 years. Always happy with the results until the last collars I bought in May. Still pulling ticks off.. Maybe a bad batch, but awfully expensive for 3 dogs with no results.????

      1. I bought mine in May also and I’m still finding fleas!! When you spend 100$ and change you expect the product to work!!

      2. I only buy my Seresto collars from the vet. Although they seem to be a good price elsewhere, the vet orders them directly and so they are fresh and new. Rebates are also available, so by the time I get the rebate, I have matched the store price.

    4. Thank you so much for the research! It is very hard to find information like this on flea products without having to spend hours researching it online myself. Of course, I still did a little research before I found this site, but everything here confirms what I have read elsewhere. I still am extremely torn between purchasing a Seresto collar for our pets, mainly because of the chemicals. But we have the worst flea infestation ever, so I might just need to use them for a few months and then use the more natural powders/sprays as an ongoing preventative one the house is flea free.

      1. Hi Elizabeth,

        Thanks very much for the nice comment. I think your plan is fine, if you’re ever in complete doubt have a chat to your vet. If possible use the collar when your able to monitor your pets throughout the day.

    5. I have found the Seresto tick a flea collar to be totally ineffective. We have a large dog (Golden) and are in Northern NY which is ripe with ticks. Since having the collar on for the last week and a half we have removed two live ticks. She does like to swim but according to Bayer the collar is still effective with swimming but the duration of coverage is reduced by a month or so. I understand that nothing is 100% effective but a tick a week is a bit much. If you haven’t purchased protection yet then steer away from this Bayer product. Its a waste on money.

      1. Hi Harold,

        Thanks for sharing your experience, there’s certainly a whole heap of mixed reviews. Had the ticks bitten your pup? Sometimes ticks will still end up on dogs (and other animals) however the tick repellant stops them from actually biting.

        Would be interesting for us all to know.

        1. I have 2 dogs and the first time to use seresto on both of them, a blue heeler and a german shepherd, I have found 3 ticks total since using the product on my heeler, one was a fully fed female, HUGE, and then two small dog ticks, both attached, the area is overrun with ticks so I guess 3 is better than a hundred but I wish I didn’t even have those 3.

      2. Sorry to Lol, I’d be happy with a tick a week. Yesterday alone I gathered over 50 ticks, fat and sassy off my dog and my floor (thankfully I have concrete) and he isn’t due for Vectra 3D until next week. Hence the reason I’m searching out something else.

      3. I agree with you. Seems though I have found numerous ticks here in North west Pa still biting and engorging while wearing a Seresto collar only a month old. Ticks here are numerous as we have lots of chipmunks, and squirrels.I recently even sprayed permethrin and still am finding ticks.Thanks to his white fur and regular looks as soon as he comes back in the house I am able to pic ticks by hand and fry them with a torch.

    6. Several months ago, I was at Petco and looking at the different flea and tick medicines for my animals, and was basically talked into Seresto collars. I have 4 dogs, two large and two small, plus I have 2 cats, so I purchased the Seresto collars for all of them, costing nearly $400.00 at Petco. Well, these collars are a huge waste of money, as my own animals are all itching, so they are not working on them now. Last summer (2017), I purchased the Seresto collars for my dogs, and they seem to have helped them tremendously, but not this year. I am not sure what the return policy is at Petco, but I wanted to give it some time to work, so it’s been over the normal 30 days. Is there anything you can offer as returning them seems to be my only option? Hope to hear from someone at Seresto. Thanks much

      1. Hi Patty,

        Thanks for sharing your experience. I’m sorry but I don’t work for Seresto or Petco. I suggest getting in contact with them directly. As stated in my review I definitely recommend using other products if possible.


      2. Did the same thing this year. Bought the Seresto colors for my two large dogs and seven cats. Worked liked magic last year (2017). My poor little babies are still scratching and I’m pulling fleas off every day. Spent about $400…. Not sure in going to do it next year. We live in TN. R was somewhere that fleas y love it humid… Great!!

    7. I bought the Seresto collar because I found more than 10 ticks on my dog after going for a hike. At the time my dog was on FirstShield Trio. The Seresto collar had been effective for 3 months until yesterday when I found that my dog was crawling with fleas. That’s right. He’s still wearing the collar and it’s only 3 months. The collar has had minimal exposure to water and was still applied correctly. I came to this website to try to find answers about the collar before going out to buy insecticides to treat my home.

    8. I recently read that the Lyme vaccine for dogs is not as effective as I thought it was. My dog would get a Lyme booster every year after the first 2 step vaccination. Both the vet & vet tech said that they don’t vaccinate their dogs with the Lyme vaccine due to its lack of effectiveness. I decided not to give my dog a booster this year, opting to get a Seresto collar instead.

      I applied the collar to my smooth collie, and within 24 hours she was having neurological side effects, explosive diarrhea & sever lethargy. She started trembling & acting strange. She wouldn’t eat anything. I removed the collar in the late morning, gave her a thorough bath with Dawn dish detergent (2 good lathers) and a last lather with Dr. Bronner’s lavender soap. I let her air dry. By evening, she was a bit more lively, but still had bad diarrhea. I finally got her to eat some boiled chicken. Last night, she woke me up 3 times because she had diarrhea. She didn’t eat breakfast, and I made boiled chicken & plain white rice, which she ate. She still has diarrhea, but is not exhibiting the neurological symptoms anymore. Hopefully, the diarrhea will stop when the chemicals are totally out of her body.

      Herding dogs are much more sensitive to certain chemicals & I was very hesitant to try this collar on her for that very reason. I have heard good things about this collar–my neighbor’s dog wears one without any problem–but have also read the hundreds of thousands of scary stories about it too. I guess I can add mine to the scary category. What this collar did in a matter of 24 hours to a smooth collie with very thick neck fur is mind boggling.

      So, I will keep rubbing lavender oil on her before we take our evening walks, be vigilant with insect control on my lawn & keep planting lavender, lemongrass, lemon thyme, basil & peppermint all around my property to keep bugs away.

      1. Oh my that’s terrible! We just removed the collar of our lab/retriever mix 5 1/2 yr old boy. He’s not had diarrhea but had a hug raw wound and is very lethargic. We’re taking him in tomorrow since he’s able to eat and no problems with urine output or bms. These side effects are after 4-5 days of it being off and a bath. This is a terrible thing to sell for pets.

    9. My Brussell Griffon wore the Seresto collar less than two months. We cut it off her and threw it away because out of the blue she became blind. The vet has no explanation and sent us to an ophthalmologist. The visit was inconclusive but he was 90% sure she had SARDS.
      I believe the collar had something to do with this. The vet says no, but they sold us the collar.
      My husband and i now are second guessing ever using that collar. It has been 5 months and our hearts ache every day watching and wondering if we caused this. Use this collar with CARE- i would never use it again.

    10. Hi there…. I was wondering…. did you ever do bravecto reviews? I was hoping that you may have. My two dogs died within a month of administering that product and they went under 3 weeks apart….both lost half of their body weight 4 lbs to 2 lbs and 28 lbs to 16 lbs. I found out that the FDA shot it down for humans (spraying on crops) and that a group of wealthy individuals picked it up and tested it on beagles. they passed and so it went out to them and cats. Over 41K dogs that I knew of at the time back in June, died from this. I contacted an atty and the only thing he said was that we needed to show causation. I really wanted justice for all of those people who lost part of their family. I was hoping (and still hope) to do a class action. It makes me sick. What can you tell me? thank you…………………………….debbie

      1. Both my dogs had very adverse reactions from Bravecto. Scary stuff. I find it difficult to find anything that is somewhat safe yet effective. So many black legged ticks and getting worse every year. Not easy to make a decision…. that’s for sure.

    11. My dog is around 18lbs and the collar is at the last notch and it seems to only last about 3 months. Should we try the larger collar?

    12. Purchased seresto for my lab/retriever mix boy aged 5 1/2 yrs. I was happy to use this for a few reasons being it had good ratings and was economical. Applied collar mid July and by mid September he was oozing under his neck from a patch that all the hair was missing. We first thought he had an ear infection and was going to apply drops but we noticed his ears were perfect. Then the ugly raw wound under his neck was revealed. Oh my I almost got sick and knowing my boy was this ill I still can’t get over the guilt. So all of this was happening when hurricane florence was almost going to hit us here in southeast Virginia. I was trying to remember any side effects since we started this collar and the only thing I remember was what I thought was a runny nose. He is a lover of sniffing and sneezing so I chalked it up to that not realizing he was falling ill. During the entire time he would eat, be rambunctious and have normal urine and bm since starting this collar. It wasn’t until approximately the end of the two months being on this is when his lack of play and desire to greet us is when we noticed he’s not himself. And this is after the collars been off for 4-5days and a bath. He still will eat and have normal (no diarrhea) and urine output. He’s eating but not so happy to do so. He usually runs when he hears the food hit the bowl. So I’m my mind the many customers that have given this product it’s glowing reviews may not be after a while like we did. The company we purchased from gave us a refund and will alert Bayer about this. Unfortunately I discarded the wrapper and tin container it came in. He will be seen by our tomorrow morning.

    13. My beautiful, very beloved cockapoo, Chewie, was lost to us 6 wks ago due to cancer of the lymph nodes and blindness. He had been wearing the Seresto collar for 2 yrs, and had been experiencing diarrea and vomiting for quite some time. We tried many different kinds of foods thinking it could be his diet causing these problems. He was on allergy medications as his skin was always irritated, dry and sensitive. Now I’ve been reading reports of dogs dying of lymphonic cancer who wore Seresto collars. My heart is broken first of making the decision to put him down and now the thought that we caused this cancer because of putting this collar on him. My pain without him is never ending. Your comment on this devastating unnecessary loss to me?

    14. Hi there I wanted to comment on that I have a rough collie puppy, eight months old. Have been using the soresto and not happy with it as well. I purchased mine as well around May 2018. As you can’t get it in Canada. When it went through the border okay. I bought another 2 to have a good supply around the same time. I had heard really good things about this product as to less side affects. As my concern was all my other dogs were on advantage and all had developed seizures as they grew older, so we switched products to see if this would be better. Not saying advantix was the problem. Just process of elimination. Now I am wondering which is the lesser evil as I just pulled off another deer tick off of him today. So really scared. Wondering if like other responders we have a bad batch as well. It would cost me more to return the products than its worth. What is a good alternative?

    15. I put the Seresto collar on my dog Nov., 7th, 2018. She has been vomiting and having extreme thirst. Took the collar off her early this morning and plan a bath to see if she improves. It seems reasonable that any product that is toxic enough to kill & repel fleas and ticks could also have dangerous side effects. The previous collar was effective for about 6 months.

    16. Always purchase these collars at an authorized retailer online or in store. Several websites are offering them for 30 to 35 dollars. These are FAKES! I was ripped off. You cant really buy these collars that cheap. Fake collars smell kinda like lemongrass and look totally different than the authentic ones. The real ones always come in a can sealed in bag with numbers printed on it and reflectors to add to collar. If you bought a counterfeit collar take it off your pet now.

      So far no problems from my 2 Yorkies after 2 weeks.

    17. We have always used Seresto collars for our dogs and they have always worked. Just purchased 2 new collars and put them on our dogs about a month ago. My husband found 2 large ticks on our dog Easton last night that still were alive. Does Bayer replace non effective collars?

    18. Hi. Most thorough review site i have come across. also wonderful that you give pros and cons on alternative products. So my questions. I plan on using a collar on my 1YO vizsla , since I’m not in favor of oral or applied chemicals, that once given/applied, there is no turning back in the event of an adverse reaction. So to limit exposure to the chemicals on the collar, I have read that you may use them in an on/off manner. Securing the collar in a Ziploc when not in use. Realistically, my pet is not in areas exposed to tick/fleas daily only occasionally, so why subject him to constant exposure to the chemicals. I understand that this might take some pre-planning on my part. There are always those spur of the moment situations where the timing for effectiveness might be hampered. for those scenarios I keep a spray handy. As an added benefit, non daily use would also seem to extend the life of the product if stored correctly in between uses. Does this course of action make sense?
      I also read comments about in-effectiveness. As mentioned there are counterfeit products out there as one possible explanation. Variances in the manufacturing process can also happen. But did I read in your review that in some areas the pests have adapted to the chemicals? How would we find this out? In addition, some vendors of Seresto are advertising what they are selling as the “2019” version. Is there such a thing? (they show the photo of the actual tin stating this) Can some of the ineffective ones be expired? Does Baer change the formulations to combat the pests acquired resistance? whew! thanks in advance.

      1. Hi, I’m 69 years old and have had dogs all my life. I use NO chemicals on my 3 dogs. I had a St. Bernard mix who died from a flea dip… which I gave her at the doctor’s recommendation (the product was from the vet). Research and you can find a plethora of products on Amazon or make your own. I use Cedarcide, YAYA & orange guard. I spray salt on my rugs and their beds, vacuum later in the day & spray with orange guard. Periodically I put a stripe of diatemaceous earth in a strip down their back from head to tail. I make sure to brush it out before the the next application later in the week. It’s heading to the end of June & no fleas or ticks so far.
        Last year was good too. I have a grand-dog who I watch while my son works. She has a Saresto collar. I take it off & put it in a plastic bag when she’s here (5 to 6 days a week for 10 hrs. each day. I stopped putting it in a bag and one of my other dogs started not finishing his food. He’s a 100 lb. Vizla hound mix . After reading of other dogs having this reaction I’ll go back to wiping her neck off & putting the collar away again.

    19. I have a 6 year old Yorkie female..only 6 pounds. Is the Seresto flea & tick collar for small dogs okay to use on her?

    20. Interesting to read that different breeds appear to have different reactions. We lost our sweet Sheltie, Max, to kidney failure several years ago and I worried that it was because of either the flea treatment or because of the Lymes that he had. With our new rough collie, Jack, I did a lot of research and decided to go with the Seresto. Our daughter uses it on her hound dog and has had great results and the dog is healthy and happy after two years of wearing it. We live in a tick infested area. Jack had the Lyme vaccine, had several ticks (5), I put the Seresto on him and he has not had a tick since. However, he did get Lyme. He’s been lythargic and has not wanted to eat at all. No arthritis symptoms that normally go with Lyme. His kidney values were high and we feared the worst for our 1 year old beautiful boy. After a $2,000 vet bill we found that his kidneys are functioning normally and all looks well internally, but he still does not want to eat. Our vet did not see that the Seresto was the problem. Perhaps the Lyme. Needless to say, we have removed the collar, bathed the dog, are keeping him out of the grass and woods best we can for now and hope to find a solution. We are all caught between a rock and a hard place. 15 years ago you couldn’t find a tick in upstate New York. Now, they are everywhere. “These times, they are a changing.” Homeopathic remedies didn’t work on our long-haired Max and I am not sure what to try on our Jack.

    21. Bought Seresto collar about two tears ago. In a few days our dog developed open lesions on his body, The vet bills and visits ran about $1,000 to get our dog better. Our dog never reacted to loud noises. After using Seresto our dog to this day hides when he hears fireworks ,gun shots (we live in the country) or any loud noise. He will even hide and start shaking when the coffee maker beeps. We have heard from others nearby of their dog going blind and one even dying. we called their NON CUSTOMER service and were told “That is impossible”. I can not believe a class action lawsuit has not been started against Bayer.

    22. I removed my dog’s Seresto collar this morning, after 10 weeks. It kept pulling too loose, so I’ve had to check and re-adjust it repeatedly. Just adjusted it a few days ago, and last night found the bottom of her neck bald, bright red and sore. The insert said that reactions would subside in 1-2 weeks, so I moved the collar higher up on her neck. Everything looked worse this am and then, as if that weren’t enough, I found a fully engorged tick on her back less than 12″ from the collar. She already was infected (subclinical) with lyme and just finished a month of doxy a few weeks ago.

      I feel absolutely heartsick. I do 2+ tick checks/day with a flashlight. The last couple days I slacked off on her back with the flashlight after never finding anything there for months, and only a couple dead ticks on back legs.

    23. I just bought 5 Seresto collars for my 2 dogs and 3 cats. My main concern was my cats and Bobcat fever. My cats are strictly indoors but the dogs go in and out. Since the groomer is closed due to COVID-19, I have been trimming one of my dogs fur. I have found seven ticks so far in the last few days. I thought that the collar wasn’t tight enough or the fur too thick. I trimmed more hair around the neck and tightened the collar yesterday. Still found a tick today. Can dogs be immune to this product?

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