The quickest way to kill fleas and ticks is to expose them to a wet product applied directly to the animal's entire coat, penetrating to the skin. Zodiac Double Action Flea & Tick Shampoo for Dogs and Cats kills adult fleas & ticks and contains Precor Insect Growth Regulator which effectively breaks the flea life cycle, prevents the growth of preadult stages of the flea and keeps flea eggs from hatching for 4 weeks. It is an innovative concentrated formula that soothes sensitive skin, is enriched with oatmeal, coconut extract, lanolin and aloe, leaving the coat soft, shining and manageable.