Zodiac Flea & Tick Spray for Dogs, Cats, Puppies & Kittens is a fast-acting formula that kills fleas and ticks. It combines the adult flea-killing power of botanically derived pyrethrins with the long-lasting egg-killing power of PRECOR which kills flea eggs before they mature into adults, breaking the flea life cycle. Eliminating adult fleas and flea eggs is necessary because adult fleas live on your pet, causing discomfort and skin irritation. Effective flea control requires treatment of your pets, home, and yard. If fleas are already present in your home, try Zodiac FleaTrol Carpet & Upholstery Spray or Zodiac Fogger.