Product Features: FLEE® Plus IGR for Dogs and Cats contains Fipronil and (S)-methoprene (insect growth regulator) to effectively kill fleas and ticks (including those that may transmit Lyme disease). The active ingredients in FLEE Plus IGR for Dogs feature a sustained release formula developed for fast-acting and long-lasting control of fleas, ticks, and chewing lice for up to one month on dogs. Dual Action: Fipronil with (S)-methoprene insect growth regulator effectively breaks the flea life cycle. Fast-Acting, Long-Lasting and Waterproof. Key Insects: Fleas, Ticks Signal Word: Caution Use Sites: Dogs, Cats, Puppies and Kittens over 8 weeks old Active Ingredients: Fipronil (S)-methoprene