The quickest way to kill fleas and ticks is to expose them to a wet product such as a spray that is applied directly to the animal's entire coat, penetrating to the skin. Zodiac Flea & Tick Spray for Dogs and Cats kills adult fleas and ticks and contains Precor Insect Growth Regulator which effectively breaks the flea life cycle and prevents the growth of the pre-adult stages of the flea. One treatment kills adult fleas for up to 7 days and keeps flea eggs from hatching for 60 days. Precor Insect Growth Regulator is unaffected by regular bathing/swimming.