ZoGuard Plus for CatsZoGuard Plus for Cats, comparable to Frontline Plus contains the same active ingredients and offers the same level of flea and tick protection at a better value. Fleas: Kills flea eggs & larvae effectively breaking the life cycle Ticks: Kills 4 species of ticks including Deer ticks, American dog ticks and brown dog ticks Lice: Rapid elimination of chewing lice In sizes: Small (4 22 lbs), Medium (23 44 lbs), Large (45 88 lbs), X Large (89 132 lbs)