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 & 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.