Yes, Seresto collars are waterproof so that your pet can continue to benefit from the protection even after a bath or swimming. Although, keep in mind that you should take off the collar during baths and only put it back on when your pet is completely dry. The active ingredients in Seresto soaked with water may not provide the same protection as when they are dry so it is important to make sure that your pet’s collar is completely dry before reinstalling it.