Zodiac Dual Action Flea & Tick Spray for Cats and Kittens kills adult fleas and ticks. The quickest way to kill a flea and tick is to expose them directly to a wet insecticide product. Zodiac Flea & Tick Spray is applied directly to your pet's coat, penetrating to the skin where fleas and ticks are usually found. This specially designed formula uses Precor, an insect growth regulator, which prevents flea eggs and larvae from maturing which effectively breaks the flea life cycle. One treatment controls adult fleas and ticks and prevents flea eggs from hatching for up to 2 months.