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Description & Usage

Seresto is an effective and reliable alternative to monthly flea and tick topicals and kills fleas & ticks for 8 consecutive months. Seresto innovative technology to release the active ingredients in controlled doses over an extended period of time. Without the inconvenience of monthly applications. Seresto is used to protect our pet from fleas, flea eggs, flea larvae, ticks, as well as sarcoptic mange on dogs without odor or mess. 

Precautions & Side Effects

For external use on dogs only. Do not use on other animals. Do not use on puppies under seven weeks of age. Reactions and individual sensitivities are rare but may occur. Possible side-effects include scratching, redness and hair loss, which usually recovers within 1 to 2 weeks. If symptoms persists, a temporary collar removal and bathing may be recommended until the symptoms have dissapeared. 

Active Ingredients: Flumethrin and Imidacloprid 


  1. move the collar from its packaging.
  2. Unroll the collar and remove the small plastic connectors from inside the collar, ensuring that no remnants remain.
  3. Insert the end of the collar through the buckle and loops.
  4. Adjust the collar around your dog's neck until it fits comfortably on them.
  5. Two fingers should fit beneath the collar and neck to ensure it's not too tight. Any excess length of the collar beyond an inch past the loops should be cut off, unless it is on a growing puppy, where some additional length may be needed for adjustment as the puppy grows.
  6. Check periodically and adjust fit if necessary, especially on growing puppies.
  7. Seresto® comes with three optional reflector clips that can be attached to the collar to help keep your dog visible at night. The reflector clips should be evenly distributed on the non-overlapping part of the collar.


How do Seresto® collars for dogs work?

The Seresto® collar works with a unique polymer matrix of two active ingredients, which spread from the site of direct contact over the skin surface of your dog:

  • Imidacloprid has been used in products for years to control flea infestations.
  • Flumethrin effectively kills and repels ticks.
  • Flumethrin works together with imidacloprid to provide dual action against fleas and ticks. No other product has this combination of ingredients.

Is Seresto® for dogs water resistant?

Seresto® for dogs 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. 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.

Do Seresto® collars for dogs expire?

There is no expiration date required on the packaging by the EPA for Seresto® for dogs. The product should be kept in its original packaging and stored as directed on the label.

Can I bathe my dog with the Seresto® collar on?

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. 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. Please use a gentle, soap-free pet shampoo.

How long does Seresto® for dogs take to work?

Seresto® kills existing fleas on dogs within 24 hours after application. Once Seresto® has been on your dog for 24 hours, re-infesting fleas are killed within two hours. Infestation prevention with new ticks starts within 48 hours after Seresto® collar application. Re-infesting ticks are repelled and/or killed in as quickly as 6 hours.

What's the difference between Seresto® for dogs vs Nexgard, Frontline Plus, Bravecto and Simparica?

Seresto® works to kill and repel fleas and ticks for 8 continuous months. That’s a big deal because a bite from a flea or tick can be painful and can transmit deadly diseases.