ZoGuard Plus for Dogs is a convenient spot-on treatment for fast-acting, long-lasting control of fleas, ticks, and lice. For use in dogs and puppies 8 weeks of age or older. Kills all stages of fleas and ticks. ZoGuard Plus for Dogs contains 9.8% fipronil and 8.8% S-methoprene insect growth regulator to stop and prevent re-infestation. Do not reapply sooner than every 30 days. Do not use on cats.