PETARMOR Squeeze on Dog Flea and Tick Repellent, 6 Month Pack for 23 to 44-Pound Provides the same flea and tick protection as Frontline Top Spot, at a significant savings Fast acting: Begins working in as little as one hour Kills ticks: American dog ticks, brown dog ticks, lone star ticks and the ticks that may transmit Lyme disease Kills adult fleas