(Sergeant's) Sentry FiproGuard Plus IGR for Dogs contains Fipronil and insect growth regulator (IGR) Novaluron. Provides protection against fleas, flea eggs, ticks, and chewing lice. Long-lasting formula breaks the flea life cycle and protects dogs for up to 30 days. FiproGuard Plus IGR for Dogs is for dogs and puppies over 8 weeks of age. Waterproof.