Frontline Spray is an active flea and tick treatment for controlling fleas, ticks and biting lice on adult cats and dogs. The topical solution provides long-lasting control over fleas and ticks on pets. It kills adult fleas in less than 24 hours of spray and stops existing infestations. Frontline Spray is effective against all stages of ticks, including brown dog ticks and paralysis ticks. Frontline Spray remains active for 2 months against fleas on dogs, 6 weeks against fleas on cats and effective for up to 4 weeks against ticks on dogs and cats. When applied monthly, the flea and tick control product prevents flea allergy dermatitis on dogs and cats. The water-resistant solution remains effective even when your pet gets wet.