Frontline Spray is a long-acting insecticidal spray for the control of fleas and ticks on dogs and cats. Frontline Spray is a topical liquid for the treatment and prevention of flea infestation and control of adult brown dog tick and paralysis tick. Frontline Spray has a rapid onset of action and kills re-infestations with newly acquired adult fleas for up to 12 weeks on dogs and 8 weeks on cats, and ticks for up to 3 weeks on dogs and cats.