SENTRY Fiproguard is a topical flea and tick treatment that protects your pets from fleas, ticks and chewing lice. As a generic equivalent of Frontline® Top Spot®, Fiproguard uses the same active ingredient, fipronil, in the same concentration. Fiproguard battles adult pests to keep your pets comfortable and safe - but at a lower price.* Choose from four products for dogs by weight range or the product for cats.