(Merial) Certifect for Dogs provides the same flea control as Frontline Plus, plus amitraz to rapidly kill and detach ticks. Certifect for Dogs is a convenient spot-on treatment for fast-acting, long-lasting control of fleas, ticks and lice in dogs and puppies older than 8 weeks of age and at least 5 pounds. Contains fipronil, amitraz and insect growth regulator S-methoprene. Starts killing ticks within 6 hours of application. Kills up to 100% of ticks within 18 hours. Detaches ticks that have already attached to dogs. Provides control of ticks for one month. Kills fleas, flea eggs, flea larvae and chewing lice. Prevents the development of all stages of fleas for one month. Do not apply Certifect for Dogs more than once per month. Do not use on cats. Waterproof.