Cats are clean creatures by nature, so nothing irritates them more than finding fleas and ticks! Ick! Protect them with new SENTRY Fiproguard Plus. SENTRY Fiproguard Plus kills fleas, flea eggs, flea larvae, ticks and chewing lice. The fast-acting, long-lasting squeeze-on is formulated to protect your cat against dangerous pests. It breaks the flea life cycle by killing flea eggs and larvae and kills ticks that may transmit Lyme disease.