Seresto Flea & Tick Collar for Dogs, over 18 lbs
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With its innovative delivery system, the Seresto 8 Month Flea & Tick Collar for Large Dogs & Puppies offers a breakthrough in tick and flea control for your precious pup. This veterinarian-recommended treatment is specifically formulated to repel and kill fleas and ticks on contact with no painful biting required. Inside the unique polymer matrix of this easy-to-use, non-greasy, odorless collar are two active ingredients: imidacloprid to control flea infestations, and flumethrin to repel and kill ticks, larvae and nymphs. These ingredients work together to provide dual-action protection against parasitic pests for up to eight months!
Key Benefits- Veterinarian-recommended prevention treatment kills fleas and ticks on puppies and dogs 7 weeks and older weighing over 18 pounds.
- Starts to repel and kill fleas within 24 hours of initial application and re-infesting fleas within two hours; works on contact with no painful biting required.
- Also repels and kills ticks within 48 hours of initial application and re-infesting ticks within in six hours; works on contact with no painful biting required.
- Easy-to-use, 27.5-inch adjustable collar is odorless and non-greasy; quick-release feature and visibility reflectors provide extra safety.
- Water-resistant formula continues working for up to eight months, even after bathing, swimming and sun exposure.
Read the entire label before use. Use only on dogs. Do not let children play with this collar.
Important Information
Fleas rise to the top of your pet's coat as they die, so consider it a triumph if you start seeing more fleas at first, after treating your pet. If you’re still seeing fleas after application, it may be because your pet has picked up new fleas from the environment, which may include other pets, surfaces and outdoor areas. It may take up to 30 days to break the entire flea life cycle. Additionally, you should also treat sources of new fleas (i.e., carpet, yard, etc.) to ensure complete flea control.
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Item Number61519
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UsagePrevention
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BrandBayer
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LifestagePuppy, Adult, Senior
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Breed SizeMedium Breeds, Large Breeds, Giant Breeds
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Collar TypeFlea & Tick
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Product FormCollar
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Health ConditionFleas, Ticks
Active Ingredients: Flumethrin 4.5%, Imidacloprid 10.0%.
Use only one collar per animal. Fit collar around your pet's neck, allowing for 2 fingers to fit between the collar and your pet's neck to ensure a comfortable, yet snug, fit. Once collar is properly fitted, cut off any excess collar measuring 1" or longer. The collar should be worn continuously for the 8 month protection period. Check periodically and adjust fit if necessary, especially when puppies are rapidly growing. Keep the collar in the bag and in the outer packaging until use. Replace the collar after 8 months for optimal tick and flea protection.
Water Resistance: It is unnecessary to remove the collar before immersing your pet in water. Seresto remains effective following a shampoo treatment, swimming or exposure to rain or sunlight. In order to maintain an 8 month duration, pets must not be bathed more than once a month. For pets that swim once a month or more, the control duration is reduced to five months for fleas and seven months for ticks.
Size | Neck | Recommended Weight | Recommended Age |
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Small | 15 inches | up to 18 lbs | over 7 weeks |
Large | 27.5 inches | over 18 lbs | over 7 weeks |
Where is this product sourced from?
We source all our products from manufacturer approved distributors or directly from the manufacturers. Chewy takes pride in ensuring that our furry friends’ wellbeing is always our top priority. We have worked hard to partner with all of the manufactures to deliver 100% authentic products
I have never had a flea problem before. Where are my pets picking up fleas?
Fleas are very hardy pests that are quite capable of hitching rides on a variety of mammals. Wild animals or feral pets traveling through the environment may be a source for a pet’s exposure.Fleas may be brought to the house by: * You – attached to clothing, luggage, dog blankets, etc. * Your pet – any time your pet steps outside your house, they are potentially exposed to fleas, especially in areas where there are other animals. * Stray or homeless cats and dogs – since these animals are not being cared for, they are easy targets for fleas. A single feral cat walking through your backyard even just one time may drop many flea eggs into the grass or under shrubs. * Wildlife – particularly raccoons and opossums. These animals typically aren’t seen very often, because they are active at night. A single opossum can carry as many as 1,000 adult fleas! An opossum walking through your backyard even just one time can drop many flea eggs into the grass or under shrubs as they pass through. * Non-treated pets in the household – most dogs are treated for fleas and ticks. Often, the cats in the household are not, especially if they are indoor only cats. * Non-treated pets in the neighborhood – you may be vigilant about treating your pets for fleas, but your neighbor(s) may not.
What are the benefits of Seresto?
Inside the unique polymer matrix of Seresto are two active ingredients:
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Imidacloprid has been used in products for years to control flea infestations.
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Flumethrin effectively repels and kills ticks.Flumethrin works together with imidacloprid to provide dual action against fleas and ticks. No other treatment has this combination of ingredients.The active ingredients spread from the site of direct contact over the skin surface of the cat or dog.Sustained release technologySeresto works similarly to a monthly topical, but as the active ingredients wear off over time, a new supply is continuously replenished in low concentrations. The active ingredients spread from the site of direct contact over the skin surface.Bayer's polymer matrix technology is designed to slowly and continuously release the active ingredients for eight months, a duration that makes it clearly different from other flea and tick collars.
Is Seresto water resistant?
Seresto is water resistant. The active ingredients of Seresto are contained within the Bayer Polymer Matrix, making it water-resistant. Therefore it is unnecessary to remove the collar before the pet is immersed in water. Seresto remains effective following a shampoo treatment, swimming, or after exposure to rain or sunlight. Under normal conditions, effectiveness lasts for eight months. In order to maintain an 8-month duration, dogs must not be bathed more than once per month. For dogs that swim once a month or more, the control duration is reduced to five months for fleas and seven months for ticks.
What if my cat or small dog gets stuck while wearing a Seresto collar?
Because some pet owners may be concerned that a cat or small dog could get stuck while wearing a collar, Seresto is designed with a safety release mechanism. In the unlikely event of the cat being trapped, the cat's own strength is sufficient to widen the collar to allow for quick release.A hard pull causes the ratchet-release mechanism to allow a widening of the collar.The small dog and cat collars are equipped with a predetermined breaking point. A harder pull triggers the breaking of the collar at this point.
What is the expiration date for Seresto for dogs?
There is no expiration date required on the packaging by the EPA for this product. The product should be kept in its original packaging and stored as directed on the label.
When can I bathe my dog after application of Seresto for dogs?
We recommend bathing BEFORE applying product. Seresto is water-resistant and remains effective following a shampoo treatment, swimming or after exposure to rain or sunlight. Under normal conditions, effectiveness lasts for 8 months. In order to maintain an eight-month duration, dogs must not be bathed more than once per month. For dogs that swim once a month or more, the control duration is reduced to 5 months for flea control and reduced to 7 months for tick control. There is no need to remove the collar for bathing. Please use a non-stripping, pet shampoo.
How often can I allow my dog to swim when using Seresto for dogs?
Seresto is water-resistant and remains effective following a shampoo treatment, swimming or after exposure to rain or sunlight. Under normal conditions, effectiveness lasts for 8 months. For dogs that swim once a month or more, the control duration is reduced to 5 months for flea control and reduced to 7 months for tick control. There is no need to remove the collar for swimming.
How often can I bathe my dog when using Seresto for dogs?
We recommend bathing BEFORE applying monthly product. The product can be applied once the pet is towel dried.* We suggest using non-stripping shampoos that are specifically designed for use on pets.* ‘Non-stripping’ shampoos are generally soap free formulations designed for general cleansing. Bayer makes a variety of shampoos that are non-stripping, general cleansing shampoos.* Seresto is water-resistant and remains effective following a shampoo treatment, swimming or after exposure to rain or sunlight. Under normal conditions, effectiveness lasts for 8 months. In order to maintain an eight-month duration, dogs must not be bathed more than once per month. There is no need to remove the collar for bathing.
How do I store and dispose of Seresto?
Do not contaminate water, food or feed by storage or disposal.* Storage: Store in the original unopened container in a cool, dry place that is inaccessible to children.* Disposal: Dispose of container, pouch and expired collar in trash.

Vet-Recommended Flea and Tick Protection
Help your dog lead the pack with long-lasting 8 month protection from Seresto. This easy-to-use, non-greasy, odorless collar kills and repels fleas and ticks for eight continuous months with daily wear, and can even help treat and control sarcoptic mange and lice. Get the performance you expect from a monthly treatment in an economical collar for convenient, effective protection.
Continuous Release for Long-Lasting Prevention
With Seresto, fleas and ticks are killed and repelled through contact, with no biting required. The active ingredients stored within the collar release in low concentrations with daily wear and distribute over your dog's skin and coat from head to tail for effective coverage. As the active ingredients wear off over time, the collar continuously replenishes the skin and coat with a new supply, for 8 continuous months.

Why Choose Seresto?
The veterinarian-recommended Seresto collar is non-greasy and helps avoid the inconvenience of applying monthly treatments. If fleas and ticks are repelled, they cannot bite and transmit dangerous diseases. It also helps to treat and control sarcoptic mange and kill lice. Seresto also doesn't interfere with your dog's regular collar and can easily be worn simultaneously.
Seresto Dog Collar Features
Effective and Convenient Protection Against:
- Fleas
- Ticks
- Flea Larvae
- Sarcoptic mange
- Chewing lice
Lasting Protection:
- Lasts eight continuous months
- Fights fleas and ticks through contact
- Sustained Release Technology releases a continuous supply of effective ingredients as your dog wears it
Easy to Use:
- Non-greasy
- Odorless
Active Ingredients:
- Imidacloprid
- Flumethrin
COLLAR FEATURES:
- Ratchet release mechanism on all Seresto collars.
- Small dog collars also include a predetermined breaking point.
- Optional reflector clips included for nighttime visibility
Protection Your Pet Can Wear
Seresto brings convenience to every pet owner with lasting 8 month protection against fleas and ticks. Plus, Seresto works through contact which means fleas and ticks don't have to bite for the active ingredients to work. It's also available without a prescription, so it's just one less step to take care of.

A Little Water Never Slowed You Down
Seresto is water-resistant and remains effective following a shampoo treatment, swimming or after exposure to rain or sunlight. Under normal conditions, effectiveness lasts for 8 months. In order to maintain an eight-month duration, dogs must not be bathed more than once per month. For dogs that swim once a month or more, the control duration is reduced to 5 months for flea control and reduced to 7 months for tick control.
About Seresto
Seresto is manufactured by Bayer, a leading name in the healthcare industry for over 150 years. Seresto kills and repels fleas and ticks for eight continuous months in one easy-to-use, non-greasy, odorless collar. It effectively kills fleas and ticks and is veterinarian-recommended, so you can feel confident knowing that your pet is getting effective protection.

Customer Reviews
86% Recommend
86% of reviewersrecommend this product
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Pet collar linked to almost 1,700 pet deaths. USA TODAY
By Lailadov on Mar 4, 2021
This is an article from USA TODAY. March 3. 2021: Popular flea collar linked to almost 1,700 pet deaths. The EPA has issued no warning. JOHNATHAN HETTINGER | MIDWEST CENTER FOR INVESTIGATIVE REPORTING Updated 6:40 am EST Mar. 3, 2021 ..thousands of pets are being harmed, according to federal documents obtained through a public records request from the Center for Biological Diversity, a nonprofit organization that watchdogs the EPA as part of its work to protect endangered species. The center provided the documents to the Midwest Center for Investigative Reporting. Since Seresto flea and tick collars were introduced in 2012, the EPA has received incident reports of at least 1,698 related pet This is an article from USA TODAY. March 3. 2021: Popular flea collar linked to almost 1,700 pet deaths. The EPA has issued no warning. JOHNATHAN HETTINGER | MIDWEST CENTER FOR INVESTIGATIVE REPORTING Updated 6:40 am EST Mar. 3, 2021 ..thousands of pets are being harmed, according to federal documents obtained through a public records request from the Center for Biological Diversity, a nonprofit organization that watchdogs the EPA as part of its work to protect endangered species. The center provided the documents to the Midwest Center for Investigative Reporting. Since Seresto flea and tick collars were introduced in 2012, the EPA has received incident reports of at least 1,698 related pet deaths. Overall, through June 2020, the agency has received more than 75,000 incident reports related to the collars, including nearly 1,000 involving human harm. The EPA is in charge of regulating products that contain pesticides. The agency has known about these incidents for years but has not informed the public of the potential risks associated with this product, said Karen McCormack, a retired EPA employee who worked as both a scientist and communications officer. McCormack said the collars have the most incidents of any pesticide pet product she’s ever seen. … more
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Always my choice
By jami on Feb 12, 2021
I LOVE Seresto! I have had my dog on this since he was a puppy. It is not powdery and it really does work! The Seresto collar must be snug around your dog's neck in order for it to work - think space for 2 fingers under the collar! Having it loose will cause the collar to do nothing! My dog has to have multiple baths a month due to having severe skin allergies. The only downfall Seresto has for me is that after it gets wet, it only works for 6 months instead of 8 months - per the Elanco/Bayer representative I frequently speak with. But it is still a great price for the length of time and prevention it gives your dog. Another nice thing is that you can double on prevention without causing I LOVE Seresto! I have had my dog on this since he was a puppy. It is not powdery and it really does work! The Seresto collar must be snug around your dog's neck in order for it to work - think space for 2 fingers under the collar! Having it loose will cause the collar to do nothing! My dog has to have multiple baths a month due to having severe skin allergies. The only downfall Seresto has for me is that after it gets wet, it only works for 6 months instead of 8 months - per the Elanco/Bayer representative I frequently speak with. But it is still a great price for the length of time and prevention it gives your dog. Another nice thing is that you can double on prevention without causing any issues (chewable or a topical preventative.) All and all, buy this! … more
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Flea Infestation Gone Wrong
By lross818 on Feb 16, 2021
We bought these for our two dogs last spring to help with tick issues over the hot, outdoor, summer months. Our dogs didn't have a tick once all summer. We are in the woods, at the pond, outside (in Missouri) all summer long. Flash to August 2020, my brother in law got a puppy from a farm (he was a bit icky when he came home) and we ended up giving fleas to our cats after contact with new puppy. We bought these collars for our cats (the cat version) and it solved the Fleas on Cats Issue within 72 hours. The fleas then decided to migrate to our dogs. Mind you, we're vacuuming religiously, we have hardwood floors, we're combing, bathing everyone frequently, nothing was doing it to eliminate We bought these for our two dogs last spring to help with tick issues over the hot, outdoor, summer months. Our dogs didn't have a tick once all summer. We are in the woods, at the pond, outside (in Missouri) all summer long. Flash to August 2020, my brother in law got a puppy from a farm (he was a bit icky when he came home) and we ended up giving fleas to our cats after contact with new puppy. We bought these collars for our cats (the cat version) and it solved the Fleas on Cats Issue within 72 hours. The fleas then decided to migrate to our dogs. Mind you, we're vacuuming religiously, we have hardwood floors, we're combing, bathing everyone frequently, nothing was doing it to eliminate the flea problem. We gave up and decided to order the dogs new collars. We continued with our cleaning regimen, gave the dogs baths, gave them their new collars, and we were completely flea free within 3 days. These collars are amazing and DO work on fleas and ticks. My ONLY gripe was that their previous collars had quit working, requiring us to buy new ones before the 8 months was up (about 6 months). Had the flea outbreak NOT happened, we probably wouldn't have even noticed, but from now on, to be on the safe side, we will be ordering twice a year, with a fresh one at the beginning of the summer. … more
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Excellent, they work!
By Pamela1 on Feb 1, 2021
This is our 3rd time we have ordered the seresto collars for our 2 senior dogs. They definitely work for the entire 8 months. We take them off for baths, and when camping and swimming. We do spray them down for ticks as an extra precaution when we're out camping just because the ticks here are so thick. No problems with fleas or ticks. We have an indoor cat who I have been able to take off of her flea pill, because the dogs are not being fleas into the house. We were using trifexis for years, but my oldest senior dog who is 14 was refusing to take his pill anymore, no matter how well we hid it in treats. These collars work great, and my boys are protected.
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Amazing product!!
By Noel on Feb 26, 2021
This collar is awesome! We have a Great Dane (approx 160 lbs) & he used to get ticks all of the time! Our vet told us to try this & he hasn't had a tick since! We get him a new collar every March when it starts to get nice out & we leave it on all year.This will be our 3rd year using it. I'm not sure how it works, just that it does! I tell everyone to get this for their dogs!
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Dogs are happy
By Dogowner on Feb 28, 2021
Dogs are happy that’s what matters, old collars aren’t done yet but we will be prepared. We do save money on the collars and you can never guarantee the store will have the brand of dog food you want. You’ve got a good thing going here so keep it up
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Love this!
By Sarah on Feb 1, 2021
Our one cat got outside and brought fleas back with her, and unfortunately shared them with our 4 other animals. I tried everything, but we were getting overran with fleas. I tried sprays, other collars, bombs, flea lights and traps, but nothing worked. I was literally at my wits end. My poor little dog was getting bathed daily just to kill the fleas on her. I bought these collars for all 5 of them, and in less than 3 days, I didn’t see one flea in our house. I’ll never use anything again, these are a lifesaver!
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Worked last time not this time
By sadiemom on Feb 11, 2021
I see a lot of reviews that reflect how I feel. This is my second round with these collars with 2 different dogs and they have had them on almost a month and don't seem to be working this time. I was thrilled the first round when the collars seemed to work because with multiple dogs it's much cheaper, but this sticks. My babies are not happy and now I have to go get flea treatment from the vet. So disappointed.
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Seresto Flea collar
By Dixie on Feb 24, 2021
The collar seems to be helping with the fleas. We live in the country where there are multiple coyotes, deer, elk, and other critters that carry fleas and ticks. Every time our dogs go out to the filed they come back with fleas...this collar seems to help prevent that. I wish they were not so expensive.
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Seeds to is amazing!
By AVSNels on Feb 28, 2021
Our dogs run in tick infested fields. We use to pull ticks off the by the dozen despite using another expensive tick/flea remedy. Since switching to Soresto a few years ago, we have found maybe five or six ticks and they were all dead or dying. It is worth the price to us.