Protect your pet from the pain and irritation of fleas and ticks with this Zodiac Double Action Flea & Tick Shampoo for Dogs and Cats. The insect growth regulator Precor breaks the flea life cycle and kills flea eggs for up to 4 weeks. This shampoo effectively kills adult cat fleas, dog fleas, American dog ticks and brown dog ticks in just 1 treatment, to provide your cat or dog with soothing relief.