Activyl Tick Plus for Dogs combines the innovative flea control of indoxacarb with the proven tick protection of permethrin, giving dogs the best of both worlds, indoors and out. With proven efficacy against 4 tick species, Activyl Tick Plus for Dogs repels up to 99% of ticks and kills up to 100% with efficacy that lasts 30 days after application. DO NOT USE ON CATS.