Can Seresto Get Wet? Bathing, Swimming and Rain
Posted by Flea Collar Direct on Nov 5th 2026
Yes. The Seresto dog collar label says the collar is water resistant and stays effective after a shampoo treatment, swimming, or exposure to rain or sunlight. You don’t need to remove it. But how often your dog gets wet does change how long protection lasts.
What the label says
| Situation | Effect on protection (dog collar) |
|---|---|
| Rain, sunlight, occasional swim | Remains effective |
| Bathing up to once a month | Full 8 months |
| Bathing more than once a month | May shorten protection; the label says not to bathe more than once a month to keep 8 months |
| Swimming once a month or more | 5 months for fleas, 7 months for ticks |
Bathing a dog that wears Seresto
- Leave the collar on; the label does not ask you to remove it for baths.
- Bathe no more than once a month to keep the full 8 months of protection.
- If you want to bathe your dog, doing it before you fit a new collar is a simple way to start the 8 months fresh.
Dogs that swim a lot
Water dogs still benefit from Seresto, but plan on shorter protection: the label gives 5 months against fleas and 7 months against ticks for dogs that swim once a month or more. Mark your calendar and replace the collar sooner. A 2-pack keeps the next collar on hand.
What about cats?
The Seresto Cat label does not include bathing or swimming statements. Follow the cat label directions, and ask your veterinarian if your cat needs to be bathed while wearing the collar.
Frequently asked questions
Is Seresto waterproof?
The dog collar is water resistant, not waterproof. It stays effective after shampooing, swimming, rain or sunlight, but frequent swimming shortens protection.
Should I take Seresto off to bathe my dog?
The label does not require removing it. Bathe no more than once a month to keep the full 8 months.
How long does Seresto last if my dog swims?
For dogs that swim once a month or more, the label gives 5 months of flea and 7 months of tick protection.
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.