Kills fleas, ticks & chewing lice. M: Only use on dogs 23-44 lbs. 8 weeks or older. Kills ticks, including ticks that may transmit Lyme disease. Fast action. Waterproof. Lasting control. Compare to Frontline brand products, contains an active ingredient fipronil (PetArmor for Dogs is not manufactured or distributed by Merial, the makers of Frontline brand products. Frontline is a registered trademark of Merial). PetArmor for Dogs acts fast and is an effective, lasting, waterproof and easy-to-use application for control of fleas, ticks, and chewing lice only on dogs weighing 23-44 lbs. and 8 weeks or older. do not use more than one applicator per dog per month. Questions? Comments? 1-888-908-Tick (8425).