(Sergeant's) FiproGuard for Dogs contains Fipronil, the same active ingredient used in Frontline Top Spot for dogs. FiproGuard once-a-month topical squeeze-on kills fleas, ticks, and chewing lice. It kills deer ticks that transmit Lyme disease as well as brown dog ticks, American dog ticks and lone star ticks. It also controls mites that may cause sarcoptic mange. Fast-acting and long-lasting, sustained-release formula protects dogs for up to 30 days. FiproGuard for Dogs can be used on breeding, pregnant and lactating dogs. Waterproof.