Seresto 8 Month Flea & Tick Collar for Cats & Kittens

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With its innovative delivery system, the Seresto Flea & Tick Collar for Cats & Kittens offers a breakthrough in flea and tick protection for cats for 8 months. Inside the unique polymer matrix of the Seresto collar are two active ingredients: imidacloprid, which has been used in products recommended by veterinarians for years to control flea infestations, and flumethrin, which effectively repels and kills ticks, larvae and nymphs. These ingredients work together in this unique flea collar to provide dual action against fleas and ticks like no other treatment!

Key Benefits

  • The innovative, Sustained Release Technology in each easy-to-apply, non-greasy collar provides 8 months of effective protection.
  • It’s a convenient way to kill fleas and ticks, and to help you take care of your cat.
  • Works through contact, killing fleas that can cause painful bites.
  • Application is easy. Takes minutes to adjust on your cat, and provides treatment that is long lasting against fleas and ticks.
  • Features a breakaway feature to added safety.


Read the entire label before use. Do not let children play with this collar.

Active Ingredients

  • Flumethrin 4.5%
  • Imidacloprid 10.0%

See all items by Seresto

  • Item Number
  • Brand
  • Lifestage
    Kitten, Adult


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.

Frequently Asked Questions

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 back yard 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 back yard 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?

With its innovative delivery system, Seresto offers a breakthrough in flea and tick protection for dogs or cats for eight months.

Features and benefits:

  • For dogs or cats
  • Kills fleas
  • Repels and kills ticks. If a tick is repelled, it cannot attach and transmit disease-causing organisms
  • Non-greasy, odorless, easy-to-use

How does Seresto work?

Inside the unique polymer matrix of Seresto are two active ingredients:

  • Imidacloprid has been used in products for years to control flea infestations.
  • 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 technology

Seresto 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.

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.

If your cat is not used to collars

Rarely, mild application site reactions may occur such as scratching, redness and hair loss, which usually recover within 1 to 2 weeks without the need for collar removal. In some cases, temporary collar removal and bathing may be recommended until symptoms have disappeared. In very rare cases, application site reactions such as dermatitis, inflammation, eczema or lesions may occur. In these instances, collar removal is recommended. If signs persist or become more severe, consult a veterinarian immediately.

What is the expiration date for Seresto for cats?

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.

How do I store and dispose of Seresto?

Do not contaminate water, food or feed by storage or disposal.

  • Storage: Store in original unopened container in a cool, dry place that is inaccessible to children.
  • Disposal: Dispose of container, pouch and expired collar in trash.

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Customer Reviews

Seresto 8 Month Flea & Tick Collar for Cats & Kittens is rated 4.7 out of 5 by 668.
Rated 5 out of 5 by from Vet recommended My three cats were all on a topical drop I got from the vet, but my boy started getting a bad skin reaction from it. Both the manufacturer of that product and my vet recommended I try the Seresto collar on him instead. He had fleas when I adopted him that he shared with my girls and we hadn't quite gotten them under control yet, but with the Seresto collar, there's been no sign of fleas or flea dirt on him and the other product works for the girls. They won't wear collars so I haven't tried switching them yet. I'm thrilled the fleas are gone. I'm sure my "buggy boy" is too. It was super easy to put on and he hasn't shown any signs of dermatitis or being annoyed by it. He's a big cat, so he was already wearing a small dog collar, made for an easy transition. It's really slim and gray in color so it doesn't look tacky like the cheapo flea collars. Mainly, it works and doesn't bother his skin and is cheaper in the long run. That's what I care about most
Date published: 2017-03-04
Rated 5 out of 5 by from YES! YES! YES! (You'll want what I'm having!) We have eight cats. After having much luck with drops, they just all stopped working effectively. I had heard of Seresto but was a bit intimidated by the initial output of cash for eight collars. But as things got worse and our poor kitties were scratching more and more, I decided to just bite the bullet and get them. None of my kitties wear collars. I was scared they would freak out about having them on. I was also scared of reactions they may have. All the worry was for naught. They have adapted well to being "collared" and there have been no reactions at all. The fleas are pretty much gone. The instructions say it takes two hours to kill anything that jumps on them so the few bits of scratching I do see, I account to that. When you do the math, if these do indeed last eight months, they are considerably cheaper than the drops.
Date published: 2017-02-05
Rated 5 out of 5 by from The only thing that worked When my indoor cats get fleas, I usually go buy frontline because it is the only flea medicine that would work but last year and this year it seemed to have no effect on the fleas. My cats were miserable. I was afraid to try the cheaper flea treatment because they are very sensitive and it had made them sick in the past. I tried the Walmart brand that said it was like frontline and it had no effect on the fleas either. I was into this like $100 dollars and was so frustrated. So, nothing was working and they were miserable. So i decided to try Seresto flea collar. I bought them at 40% off and worried that they wouldn't keep them on, that they would be sensitive to the medicine on it, or that it wouldn't work. I am so happy to report that it is worth the extra money! After about one minute they didn't even mind the collar, they didn't have any reactions and it killed all the fleas and it is supposed to work for 8 months!! I am using this from now on. Thank you.
Date published: 2016-10-20
Rated 5 out of 5 by from Better than I expected!! Where I live we have an unbelievable problem with fleas in our yard. I had never had any luck with flea collars in the past so I was not sure that I really wanted to pay a great deal of money for one and not really know if it would work either. I talked to my veterinarian first to see what his opinion was on the effectiveness of the collar and he highly recommended it. About a day and a half after putting this collar on my 2 cats they were flea free! You could literally see the fleas dying and falling off of them! It was unreal. I was ecstatic because I had done everything I knew to do and this was really a last resort. Definitely definitely worth the money! And the best deal I have ever seen is ordering with chewy.com for this product! This company has to be the best I have ever ordered from. I have not had a single problem and I get my order in exactly 2 days everytime I have ordered. Love love love chewy.com and highly recommend the collar!
Date published: 2016-11-10
Rated 5 out of 5 by from easy to use I had spent hundreds of dollars attempting to end our flea problem. .to knock it out not down. I bought two for my pups and two for cats and due to the length was able to stitch pieces to a elastic for the third. one cat did get a burn around his neck which I felt terrible about but the fleas had done worse killing 3of my geriatric cats. I switched out the homemade one to kitty who reacted bad and he is finally on the mend. I think he just was to sensitive to the direct contact. I tried for months everything apple cider vinegar and dawn would kill them but the adult population had to go and then there were hatchlings everywhere regardless of what I did. I even gave the cats baths. Don't waste money with any thing else. treated the environment with Nature Vet spray every other day for two weeks.
Date published: 2017-02-16
Rated 5 out of 5 by from Works Great on My Cat when No Other Flea Meds/Collar would. I have always used,Frontline,Advantage Flea Meds with ok luck,it except it made my Cats feel Ill on the initial dose.My Cat became allergic to Fleas and these products no longer worked,My Vet suggested this collar over 2 years ago,it's Magic! I put it on and initially it took a few weeks to help him but after that and consistently changing it every 8 months His Allergy problem is cured and Best of all he doesn't get Ill when I put on a new one,and It WORKS! CHEWY has the best price,they auto ship to me so we easily stay on track with the 8 month change.Just be careful not to put on too snug because it is like a Zip tie,you can't loosen it! My Cat gained weight over the winter and it became too tight so I had to cut it off early for his well being.Otherwise I would Totally recommend it!
Date published: 2017-03-17
Rated 3 out of 5 by from Live tick on cat for five hours. Unfortunately I have 10 cats and have already invested in 6 collars. Plus one for the dog. I've been buying them in stages since they are expensive. Anyway, my cats have been wearing them for at least 2 weeks (some longer). One cat (on March 9) came to 8am breakfast with a tick attached to his butt. I left it to see what would happen. At 12:30 it was still present so I removed it and watched it walk around in the jar I'd placed it in. At that point I called Bayer - the number on the back of the collar tin. The representative was friendly and explained that no product is 100% effective against ticks. Sad, though, as Frontline seems tried and true when it comes to keeping my guys clear. I wanted to avoid the monthly applications though. And an 8 month collar sounded AMAZING. She offered to send a spray that will contact-kill ticks, but that still doesn't help that the collar isn't effective down to the cat's bottom. I gave it three stars because I am holding hope that as tick season worsens the collars will prevent ticks around the head and neck. But it is difficult for me to recommend people spend money on the collar when they could use a cheaper product until this one is improved.
Date published: 2017-03-10
Rated 5 out of 5 by from Fast and thorough Have an indoor Himalayan cat. Am told this year was HORRIBLE for fleas and somehow she and I got them! The instant I saw a flea on her, I bathed her in blue Dawn dishwater and took to the internet to find a product. Various reviews and information led me to Soresto collars. Chewy & FedEx had the delivery to me IN LESS THAN TWENTY HOURS! The product worked as advertised! It's a process though, which relies on your cat being the vector which carries the agent to the fleas. My cat had no harmful reaction to the product. And yes, a few days after the initial die-off, more adult fleas may be seen, because there were eggs on the pet. But the lifecycle and the infestation has been interrupted. They disappear. I was curious and had questions and the 800 number resulted in fast, friendly, helpful, knowledgeable associates. I'll buy another and I already recommend Chewy and Soresto.
Date published: 2016-11-12
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