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Seresto dog holding flamingo

Whatever your dog
brings home, it shouldn't
be fleas and ticks.

Dogs will be dogs. Whether they get into the garbage can out back or dig up that old shoe in the yard, Seresto® for dogs can help keep them protected from fleas and ticks for 8 continuous months. The innovative Sustained Release Technology of Seresto® provides effective flea and tick protection in an easy-to-apply, non-greasy collar.

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Seresto® Benefits

Seresto® is an easy-to-use, odorless collar that kills and repels fleas and ticks for 8 continuous months. It also aids in the treatment and control of sarcoptic mange and kills lice.

Seresto® kills and repels fleas Fleas
Seresto® kills and repels ticks Ticks
Flea Larvae
Seresto® aids in the treatment and control of sarcoptic mange Sarcoptic mange
Seresto® kills lice chewing lice

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Product Label Application & Safety Information
Seresto<sup>®</sup> for large dogs  packaging and collar
  • Seresto® for dogs is engineered for 8 months of continuous protection.
Eight months of flea and tick protection

Truly unique technology for your dog.

  • Seresto® is a unique polymer matrix collar that offers a continuous supply of two active ingredients: imidacloprid and flumethrin for effective 8-month protection against fleas and ticks. That's one convenient, non-greasy, odorless flea and tick collar instead of 8 monthly treatments.

    The active ingredients are stored within the collar. They are released in low concentrations and are distributed over your dog's hair and skin surface for 8 months. As active ingredients wear off over time, Seresto® for dogs continuously replenishes the skin and coat with a new supply of active ingredients. Fleas and ticks are killed through contact with the active ingredients — no biting required.

Seresto® means 8 months of
effective, convenient protection.

  • Why Seresto® gets solid reviews

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    See what dog owners and veterinarians alike are saying about Seresto®. 2:10

  • How the Seresto® flea collar works

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    Learn how the two active ingredients work together to help protect your dog for 8 months. 1:53

  • How to apply the Seresto® collar

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    See how easy it is to apply to your dog for 8-month protection. 1:51

  • How the Seresto® two-way release system works

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    Seresto® small dog collars are designed with special release mechanisms. See them in action. 1:38

  • Seresto® flea efficacy

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    Watch Seresto® kill fleas effectively in this video shot four days after application. 1:42

  • Seresto® tick efficacy

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    Watch Seresto® effectively repel ticks four days after application. 1:43

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See for yourself how Seresto® for dogs compares to Frontline® Plus.

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  • Dog on a mountain wearing a Seresto flea & tick collar

    Works for your dog.

    Fleas don't have to bite to die. Seresto® works through contact, killing and repelling fleas that can cause painful bites.

    Protection against ticks. Seresto® kills and repels ticks, too. And if a tick is repelled, it can't attach and transmit diseases.

    Less stress. With 8 months of continuous protection, you don't have to worry about monthly treatments - easier on you and your dog.

    Water Resistant*. No need to remove the collar before swimming or bathing.


    *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 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 flea control, and reduced to seven months for tick control. 

  • Works for you.

    Less hassle, no mess. The Seresto® collar is non-greasy, and helps avoid the hassle of applying monthly treatments.

    Easy to use. Application is easy. Seresto® takes minutes to adjust on your dog, and provides treatment that lasts 8 months.

    Designed for your dog. The Seresto® small dog collar has a two-way release feature that allows your dog to get out of tight spots.

    Seresto dog holding swimsuit

Seresto collar infographic - flea & tick facts


Dog in a field wearing a Seresto collar

The more you know, the better. For both you and your dog.

  • Learn about the ins and outs of fleas and ticks, how bites can affect your dog, what can happen if left untreated, and more.

    Can't seem to get rid of fleas?Learn More >

    Fleas aren't just annoying - they can cause health issues. Learn More >

    Tick disease: it only takes one bite.Learn More >

Did you know that Seresto® is also available for cats? SEE SERESTO® FOR CATS

1Anderson FJ, Magnarelli LA. (2008). Biology of ticks. Infect Dis Clin North Am. 22(2):195-215.

2Dryden M, Gaafar S. Blood consumption by the cat flea, Ctenocephalides felis felis (Siphonaptera: Pulicidae). J Med Entomol 1991;23(3):394-400.

3Safeguarding animals from summer heat and pests. World Animal Foundation website. Available at: http://www.worldanimalfoundation.net/f/safeguardinganimalsfromsummerheatandpests.pdf. Accessed December 4, 2014.

Seresto® is protected by U.S. Patent No. 7,910,122.

Frontline is a registered trademark of Merial.