Make your dog’s health and comfort a priority with the Seresto Flea & Tick Collar for Dogs. This long-lasting collar works to kill and repel fleas and ticks for eight continuous months. The fast-acting formula is designed to start working within 24 hours. Seresto kills and repels fleas by contact, so pests don’t have to bite your dog for the collar to be effective. Plus, the adjustable collar is ideal for most dogs and puppies over seven weeks of age. Seresto offers a non-greasy, hassle-free way to protect your pup from pests.