Zodiac Flea and Tick Spray - kills adult cat fleas or dog fleas, American dog ticks or brown dog ticks. Effectively breaks the flea life cycle and prevents the growth of the pre-adult stages of the flea. On cats and dogs, one treatment kills fleas for up to 7 days and keeps flea eggs from hatching for 2 months. Active ingredients Piperonyl Butoxide and Pyrethrins.