New and improved K9 Advantix II repels and kills ticks and kills all flea life stages, including eggs. Prevents the development of fleas, flea eggs, pupae and larvae for a month. Works through contact, so fleas don"t have to bite to die. Protects against ticks that may transmit disease-causing organisms such as ehrlichiosis, Lyme disease, anaplasmosis, and Rocky Mountain spotted fever. Kills ALL flea life stages, including eggs Prevents fleas on treated dogs from infesting your home Kills fleas within 12 hours of application Kills reinfesting fleas within two hourSafe for dogs and puppies over 7 weeks old. Not for use on cats.