Zodiac Flea and Tick Spray can be used on dogs, cat, puppies and kittens to control fleas, ticks and flea larvae. This highly effective formulation combines the adult flea-killing power of natural pyrethrins with the long-lasting egg-killing power of Precor Insect Growth Regulator and provides quick relief from biting fleas. It also continuously kills flea eggs laid on the animal, breaking the flea life cycle. Zodiac Flea and Tick Spray is also used to kill and repel mosquitoes and leaves no visible residue or odor. (S)-Methoprene IGR in it kills larvae and prevents flea eggs from hatching up to 7 months.