Seresto for Puppies and Kittens: What Age Can They Start?

Seresto can be used on young pets, with minimum ages set by the label: 7 weeks for puppies and 10 weeks for kittens.

Puppies: 7 weeks and older

• Choose by weight: Small Dog up to 18 lbs., Large Dog over 18 lbs.
• Do not use Seresto on puppies younger than 7 weeks.
• If your puppy grows past 18 lbs. during the 8 months, switch to the Large Dog collar.

Kittens: 10 weeks and older

• Use the Seresto Cat collar, which is labeled for cats only. Never use a dog collar on a kitten.
• Do not use Seresto on kittens under 10 weeks.
• The cat collar has a release mechanism: if a cat gets caught, its own strength is usually enough to widen the collar for a quick release.

Fitting a collar on a growing pet

1. 1Fit the collar so two fingers slide comfortably between the collar and the neck.
2. 2When you trim, the label allows extra length on a growing puppy or kitten so you can loosen it later.
3. 3Check the fit regularly, especially during rapid growth, and adjust as needed.

See the full fitting guide.

Frequently asked questions

Information from the EPA-registered Seresto product labels. This is general product information, not veterinary advice; always read the full label and ask your veterinarian about your pet’s health. Flea Collar Direct is an independent retailer, not affiliated with Elanco. Seresto is a trademark of Elanco or its affiliates.