FRONTLINE Plus Flea and Tick Treatment for Dogs (Small Dog, 5-22 Pounds, 6 Doese)FRONTLINE Plus for Dogs has been trusted by veterinarians for flea and tick control for dogs for nearly 20 years. Made with 2 tough killing ingredients, fipronil and (S)-methoprene – one to kill adult fleas and ticks and the second to kill flea eggs and larvae – this fast-acting, long-lasting protection provides flea and tick control for dogs and puppies 8 weeks and older, 5-22 lbs. Its long-lasting formula is stored in the oil glands of the pet’s skin to give non-stop flea and tick protection for a full 30 days.