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

Seresto Flea & Tick Collar for Dogs, up to 18 lbs

By Seresto
Rated 4.1216 out of 5 stars

$53.83Chewy Price
$62.98Chewy Price
$51.14Autoship 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 up to 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, 15-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 SizeExtra Small Breeds, Small BreedsMedium Breeds, Large Breeds, Giant BreedsAll BreedsSmall Breeds, Medium Breeds, Large Breeds, All Breeds
LifestagePuppy, Adult, SeniorPuppy, Adult, SeniorAdultAdult
Collar TypeFlea & TickFlea & TickFlea & Tick

Questions & Answers

32 Customer Questions

My puppy is 8 weeks old and weighs 2 pounds. Is this collar sage for him?

What is the expiration date?

Can my dog sleep with me while wearing the collar ?
Answer by ChewyJul 13, 2018
It is safe to allow pets to sleep in bed with you while wearing this collar. The active ingredients spread from the site of direct contact over the skin surface, so it is not recommended to continuously touch the collar.

Can this collar be worn alongside or under another, regular collar?
Answer by ChewySep 14, 2018
This collar may be worn in addition to a regular collar. It is important to make sure the other collar does not interfere with the Seresto collar as it needs to remain in contact with the pets skin to be effective.

ReviewsWrite a Review

Rated 4.1216 out of 5 stars
2879 Reviews
Would recommend to a friend

2879 Customer Reviews

Filter by reviews that mention

Rated 1 out of 5 stars
By Michelle on Jan 21, 2023


I bought the seresto collars when they were on sale. The expiration date is still good. I have noticed fleas on my Maltese. I have not seen any on my border collie and poodle. However, I do see them scratching and if the Maltese has fleas…they probably do as well. I have also now noticed fleas in my home. To say I am not happy is an understatement!

Rated 1 out of 5 stars
By shellbaby916 on Jan 3, 2023


I had initially bought seresto collars from my vet and they worked great for all my dogs and cats. When it came time to replace them, I ordered from Chewy. The ones I received from Chewy did not work at all. I’m not sure if they are defective or if they are not legitimate seresto collars. Regardless, it was a huge waste of money…and now I have fleas in my home.

Rated 5 out of 5 stars
By cntrygal on Dec 30, 2022

Shih Tzu parent

I have bought these for 4 years now and I love them they are well worth it. The other dogs in my building seem to be bothered by fleas and ticks all the time with other methods. I will never buy any other product for my fur baby

Rated 5 out of 5 stars
By Zimrob on Dec 8, 2022

Seresto is awesome

We have been using these flea and tick collars for several years now and love them! They are very effective and do their job extremely well with no side effects, contrary to what you can read about them. Their cost at Chewy is very competitive and they arrive super fast and are well packed with excellent instructions. Highly recommend this product.

Rated 2 out of 5 stars
By Theresa on Jan 8, 2023

Not happy with this product

I bought 3 collars, 2 for my small dogs and 1 for my cat. My poor dogs still have fleas after I have treated home, and bathed, and given my dogs capstar. For the cost of these collars I accept better results

Rated 5 out of 5 stars
By Brenda on Nov 15, 2022

seresto Flea collar

LOve it love it my dogs were suffering from fleas the confortis was no longer working for them , my son told me about the Seresto flea collars I ordered from Chewy was the best thing I had done in a while with in two day I had all the fleas under control I have 6 dogs now my sister passed away so I now have her dogs so I have a crew and needed them collars bad, I also brought the spray so I could spray there doggie beds it works and I have them on reorder in 8 months Thanks Chewy

Rated 1 out of 5 stars
By Nikki on Jan 21, 2023

Still have fleas

Even after my dog had this on for two months I still found fleas on her. I have used a seresto collar before that I purchased from pet supplies plus and did not have this problem.

Rated 3 out of 5 stars
By Lilybell77 on Nov 1, 2022

use to work.

I used to buy these for my pets and never had a problem but recently that seem to not worth much longer than a month before my dog and cats had fleas. I haven’t spotted any text but they haven’t been outside much. I’m assuming the fleas either came from another pet at the vet or maybe one of the mice the cats found in the basement. Either way it’s too much money for it not to work for fleas so I’ll never be using them again. Sad.

Rated 1 out of 5 stars
By Chrystal on Nov 12, 2022


I buy these collars every year from chewy for my 2 dogs and they have always worked great, but this time I bought them and I don't know if they changed the formula in them or if I just got 2 bad collars but they are not working at all. I even gave them extra time to work because they usually only take a day or 2 to start killing off the fleas but this time my poor dogs still have fleas and it's been at least 2 months of wearing the collars. They just are not working and I'm very disappointed and frustrated. I spent $100 on 2 collars and this time my money was wasted and I'm spending more on shampoos and things to try and help. I would buy new ones to see if these ones were just a bad batch but I just can't afford it right now, so I'm out money and my dogs are still miserable.

Rated 5 out of 5 stars
By Michelle79 on Sep 11, 2022

Great protection from flees & ticks

I found this product several years ago after my dog brought flees into our house and infested my 3 indoor-only cats. It was a nightmare trying to get the flees off my pets and out of my house, but once I did, I needed to find an effective peoduct to use to keep them off the dog. After reading many reviews of this product and hearing some horror stories of pets who mysteriously died after their owners used these collars, I was initially scared and skeptical. But after doing some further research and speaking to my vet, I chose to use this flee & tick collar. I have zero regrets. It has worked reliably year after year and kept all my pets safe and healthy. I cannot recommend this product enough. I encourage anybody who may be skeptical or fearful about it to discuss it with their veterinarian.