As a dog parent, one of the last things you want is for your canine companion to be burdened with fleas, ticks and mosquitos. Hartz Ultra Guard ProMax Flea and Tick Collar for Dogs is safe and effective for dogs 12 weeks and older in killing fleas and ticks, while also repelling mosquitos and preventing flea eggs from hatching. With a dual buckle system, the Hartz Ultra Guard ProMax Flea and Tick Collar for Dogs is sure to stay in place, while its water resistant formula means that you and your canine companion can continue enjoying your swims together.