Seresto™ is an innovative, odourless, water-resistant* collar, and the convenient way to provide your dog with safe long-lasting protection against fleas, ticks, and tick-borne diseases.

1. Active ingredients (actives) are integrated into Seresto™'s innovative polymer matrix. 

2. Low doses of these actives are released from the matrix over time, as needed, and migrate into the lipid (fatty/oily) layer of your dog's skin and hair. 

3. Actives are very minimally absorbed through the skin, but remain within the naturally water-resistant lipid layer of the skin and hair - so your dog can still enjoy the water.* 

4. The actives in the skin and hair of your dog kill fleas and ticks on contact, no biting required. 

5. The hair and dead skin that your dog sheds naturally each day contain small amounts of the active ingredient, imidacloprid, killing flea larvae in your dog's surroundings. 

6. As actives are depleted from your dog's skin and hair, they will be quickly replenished from the collar matrix - ensuring consistent, long-lasting protection from fleas and ticks. 

Watch our video for more information about How It Works.

Seresto™’s innovative technology enables it to release controlled doses of the active ingredients over prolonged periods. The ingredients are transferred to your pet’s skin and fur, and spread across their entire body, keeping your dog protected from paralysis ticks for 8 months, bush and brown dog ticks for 4 months. Seresto™ has also overcome the challenges of conventional flea or tick collars, to be water-resistant* and odourless. 

*See product label. 

Ticks may still arrive on your dog when they are wearing a Seresto™ collar. However, the active ingredient, flumethrin, works on contact, which means the tick does not need to attach and take a blood meal to be killed. Once they have arrived on your dog, ticks will be rapidly affected by flumethrin and will fall off and die. 

Ticks already on your dog prior to fitting Seresto™ may not be killed immediately after collar application and may remain attached and visible. Therefore, removal of ticks already on your dog at the time of application is recommended. 

The Paralysis tick is a potentially deadly parasite and difficult to control. While Seresto™ kills paralysis ticks for 8 months and repels them for 4 months, the risk of tick paralysis cannot be entirely eliminated as it takes only one adult female tick to cause tick paralysis/poisoning. Therefore, daily searching for and removal of any ticks found is recommended.

In cases where dogs have chewed and swallowed all or part of a Seresto™ collar, veterinary attention is recommended. Mild stomach upsets (e.g. loose stools) have been reported, but have resolved within 24 hours. An explanation for Seresto™’s safety is that the active ingredients are bound within the collar matrix, limiting the amount of active ingredients available to be absorbed during passage through the gastrointestinal tract. However, it is recommended that you seek veterinary advice if part or all of the Seresto™ collar is swallowed. To prevent dogs from chewing on their own Seresto™ collar, ensure it is correctly fitted.

It’s safe for use on puppies from seven weeks of age.

No, it doesn’t. Seresto™ is odourless, so there are none of the unpleasant chemical smells you usually associate with flea and tick collars.

No, simply put the collar around your dog’s neck and make sure you adjust it to fit properly. 

No, you shouldn’t attach a leash to the collar, as the force of your pet pulling against it could potentially open the safety mechanism. Use your normal collar to attach to the leash. 

Absolutely. Seresto™ can be worn alongside your dog´s usual collar without compromising its efficacy. Always ensure that the Seresto™ collar is in contact with the skin (i.e. next to their normal fabric collar).

The Seresto™ collar is water-resistant and does not need to be removed for swimming or bathing. Always use a soap-free shampoo and towel dry under the collar after exposure to water. Read the label for more information.

Seresto™ is designed with a safety-release mechanism. In the unlikely event of your pet being trapped, the collar will widen or open, allowing for a quick release. The small dog collar has a two-step safety mechanism as it is additionally equipped with a predetermined breaking point.

In some cases, the collar can cause mild irritation leading to scratching, redness and hair loss under the collar. This usually occurs within the first one to two weeks of collar application. Typically, this resolves soon after without removing the collar, as your dog gets used to wearing it. Make sure that the plastic connectors were removed, and the collar is not too tight – always ensure you can fit 2 fingers between your dog’s neck and the Seresto™ collar. 

In some cases temporary collar removal may be recommended until the symptoms resolve. In the unlikely event that your dog develops any of these symptoms, please call Elanco on 1800 995 709 to speak to one of our Animal Health Consultants.

No, for the best flea and tick protection, Seresto™ should be used all year round. However, if you’ve removed the collar only temporarily (e.g. during grooming), you can reapply it without any problems. 

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• Small Dog
• Large Dog
• Cat