Pet Defender Plus for Cats provides comprehensive protection against fleas, ticks, flea eggs, flea larvae, and chewing lice. Featuring the same active ingredients as FRONTLINE® Plus, this fast-acting treatment starts killing fleas within 30 minutes and provides long-lasting protection for up to one month. The waterproof formula ensures continued effectiveness even after exposure to water, making it an ideal solution for active cats. This easy-to-use treatment is designed for cats and kittens 8 weeks or older, weighing 1.5 lbs or more.