Parastar Plus is a topical flea, tick, mite and lice treatment developed for dogs. Parastar Plus contains two fast-acting insecticides, fipronil and cyphenothrin, which start to kill fleas and ticks within 1 hour. It also controls mites that may cause sarcoptic mange. The topical treatment is applied to the skin and spreads into the hair follicle, killing adult fleas before they lay eggs, ticks, (brown dog tick, deer tick, American dog tick and lone star tick) that may transmit Lyme disease and Rocky Mountain spotted fever, and chewing lice for one month. The waterproof solution is an easy to use applicator and is applied to a single spot to provide flea and tick protection. Gentle enough for use on puppies twelve weeks of age or older and over 4 pounds.