ZoGuard Plus for Dogs is a practical substitute for Frontline Plus, featuring identical active ingredients and delivering comparable flea and tick protection. This product can efficiently eliminate all life stages of fleas, breaking their life cycle and preventing re-infestations. With 3 monthly doses included in each package, ZoGuard Plus for Dogs provides your medium sized dog with up to 12 weeks of protection. Additionally, it is waterproof and remains effective even after your dog is exposed to water, bathing, or sunlight. It is the perfect solution for medium-sized dogs that require reliable and affordable flea and tick prevention. Ingredients: Fipronil.. 9.8%, S-Methoprene.. 8.80%, Other ingredients 81.40%