Frontline
Frontline (Top Spot) contains the active ingredient Fipronil which affects the parasite's nervous system causing paralysis and death. Fipronil kills 100% of Fleas and Ticks within 24-48 hours of them contacting it. Fleas generally die before they can bite. Frontline Plus has (S)-methoprene added in, which is an Insect Growth Regulator that prevents new fleas from maturing. These products stay on even if the animal gets wet. Apply to the skin of the back once per month to give your pet long lasting relief from nasty parasites!