The Seresto Dog Flea and Tick Collar provides a complete 8-month prevention and treatment of harmful parasites on your dogs and puppies. It specifically targets chewing lice, fleas and ticks that carry disease-causing organisms. Seresto exterminates ticks within 48 hours, wipes out fleas within 24 hours, and chewing lice for a month of initial application. The collar is certified easy-to-use, non-greasy and odorless. This collar features Polymer Matrix technology that is resistant to water. No need to remove this collar when bathing or swimming.