SERESTO Flea & Tick Collar for Dogs, over 18 lbs, 1 Collar (8-mos. supply) -

Seresto Flea & Tick Collar for Dogs, over 18 lbs

By Seresto
Rated 4.1703 out of 5 stars

$52.13Chewy Price
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About This Item


  • 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 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.

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Play Video: Learn More About Seresto From Our Team of Experts
Learn More About Seresto From Our Team of Experts

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.

About Seresto

Vet-Recommended Flea and Tick Protection

Help your dog lead the pack with long-lasting 8 month protection from Elanco. 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.

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

Elanco 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 Elanco, 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.

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Top IngredientsActive Ingredients: Flumethrin 4.5%, Imidacloprid 10.0%.Active Ingredients: Flumethrin 4.5%, Imidacloprid 10.0%.Active Ingredients: Deltamethrin 4.00%, (S)-Methoprene 1.02%, Other Ingredients 94.98%...Peppermint, Clove, Cinnamon...
Breed SizeMedium Breeds, Large Breeds, Giant BreedsExtra Small Breeds, Small BreedsAll BreedsSmall Breeds, Medium Breeds, Large Breeds, All Breeds
LifestagePuppy, Adult, SeniorPuppy, Adult, SeniorAdultAdult
Collar TypeFlea & TickFlea & TickFlea & Tick

Questions & Answers

56 Customer Questions

How do you loosen a collar that has become to tight
Answer by ChewyDec 19, 2018
Seresto is designed with a safety release mechanism. A hard pull causes the ratchet-release mechanism to allow a widening of the collar.

Does this collar kill mites too?
Answer by ChewyAug 04, 2017
The active ingredients protect from fleas, ticks, and lice. Mites are in the same family as ticks and may be controlled by this collar, but this is not a specified function of the Seresto collar.

Is Seresto by prescription only?
Answer by ChewyFeb 20, 2018
A prescription is not required for this collar.

Can my dog wear the Seresto collar and still take an oral chewable flea product monthly?
Answer by ChewyOct 29, 2018
Full-strength preventatives are intended to be used alone. We encourage speaking with your vet before combining pest preventatives for the safest opinion.

ReviewsWrite a Review

Rated 4.1703 out of 5 stars
6672 Reviews
Would recommend to a friend

6672 Customer Reviews

Filter by reviews that mention

Rated 5 out of 5 stars
By Mikele on Jan 21, 2023

Amazing, works when nothing else did

I've lived at the same place for 3 years. We never had a flea issue. A couple of months ago they began to pop up out of nowhere. I used a treat pill to try to clear it up. That didn't work. I bought the liquid flea medicine that goes on their back. That didn't work. At this point my dog was chewed up so badly by fleas I thought he'd need a vet. His entire underbelly was covered in red inflamed bites and scabs. It was absolutely horrendous looking. I bathed him normally, used waterless shampoo, put benadryl cream on him, ointment, etc to clear him up. On the 3rd month I bought this collar. In 2 weeks he's almost completely healed up and there's no more fleas. He's happy again and so much less miserable and itchy. This collar has been a life saver.

Rated 5 out of 5 stars
By gspmommy on Dec 26, 2022

works for my dogs

I have 2 German shorthairs & a small toy fox terrier mix , I always use the seresto on the terrier year round but for the shorthairs I only use in the colder months due to them always going swimming . I have been using breveto in the warmer/hot months but once colder days I switch to these collars & have not had any issues with fleas or ticks . We live amid farms & other people's dogs that are are not treated for fleas/ticks , also my husband hunts & lots of times when he skins a deer ticks crawl every where in the yard but when my dogs are outside right after the skinning if the dogs get near a tick or two they might crawl on them but do not get a chance to bite they die or leap off . I replace the collar on my terrier every 7 months , I have learned it was much better working when replaced in 7 months instead of the 8 month term .

Rated 4 out of 5 stars
By Anna on Jan 4, 2023

Quit working

I have bought this collar for several years but the last ones I bought are not working. I have 2 dogs and they have been scratching and biting themselves. I gave them a bath today and had a flea on me and several in the bath water. This has never happened before and they have always lasted the full 8 months. I bought these 2 on Dec. 2nd and they lasted only 1 month. They are too expensive not to work and I see the price went up $10.

Rated 1 out of 5 stars
By Olivia on Jan 9, 2023


Seresto was bought by Elanco in 2020 and is no longer under Bayer! Something has changed since the switch and these no longer work! I have used these collars for years with no issues but am currently battling a full blown flea infestation. What was once a one and done (at least for 8 months) preventative is gone, look elsewhere!

Rated 1 out of 5 stars
By Smokey on Nov 28, 2022

they stopped working

To start off I've used these for 4 years. It worked really good but has never lasted the full 8 months and that's with me always taking it off for baths or any water involved. These collars are either being made different the last years but I have bought 6 collars starting Dec 2021 and used all in year bc my dog has had so many fleas abs they never left all year. We are on #6 now and been on 1 and half months. He has so many fleas still. I'll be switching now. I was fine switching at 6 months. if they are supposed to work 8 months and I'm switching at 4 months or less bc they're not doing anything anymore. These are not cheap by any means and I'm done. Baths every week with dawn flea shampoo anything u can think of and still no results. This last collar being the worst yet. Not being on 2 months and they cost $70 a piece. Go back to the old formula or tell people they last 4 months or less not the gimmick of 8 bc they've never lasted 8 for me maybe 6 and that's pushing it. Done with seresto.

Rated 2 out of 5 stars
By Mike on Nov 28, 2022

Worked well for a few years

Been using this product on my 90 lb lab four several years.this fall I noticed her scratching and noticed she had several fleas.the collar was going on the fifth month. Called the support number and told them of the problem.after answering a few questions I told them she swims weekly in the summer.they said that was probably the issue and you need to replace the collar more frequently than 8 months.they sent me a new collar witch was great but the fleas remained.after another month I called again and told them my dog is still had fleas.they then send me a frontline collar to work with the seresto collar after a few more weeks they were gone.

Rated 5 out of 5 stars
By Kathleen on Jan 18, 2023

enjoy the convinence of ordering from Chewy!

I find goods for my pets on chewy that I can't find anywhere else. I like that if I want to support an animal shelter I can send them food directly from chewy. I appreciate the auto ship so that I can count on my pet needs being met. Thank you Chewy!

Rated 1 out of 5 stars
By SamB on Dec 5, 2022

Does not work

My pup is not infested by any means, we just can't seem to get rid of the few he has. When I bathe him he will have maybe 5-10. All bedding is up, there's no carpet, everything is swept, he's only in one part of the yard. I thought this collar would do the trick along with our weekly bath and all the other tricks. But my dog still has fleas on his tail after almost 2 weeks of using this collar.

Rated 5 out of 5 stars
By jwood on Jan 4, 2023

Seresto Flea Collars

These collars work great on all my dogs and cat. However, they advertise that they work for 8 months. I can usually get 5-6 out of one collar. Not an issue for us though because this is still a cheaper and more effective options for my crew.

Rated 1 out of 5 stars
By Renae on Nov 30, 2022

Don't bother!

I bought each of my dogs one of these (totaling over $500). Gave everyone a bath before putting them on and even did a eatible to ensure the collar has a chance against SC fleas! I sprayed the yard, bedding, etc...the collars did NOTHING! I was hoping to spend a little less than what the vet has to offer, but now know it is not worth it. Terribly disappointed!