Designed to reduce leash pulling and other unwanted behaviors, the Gentle Leader Headcollar fits over a dog's nose and helps steer his attention back to you when he pulls, lunges or jumps while on a leash. The collar sits high on the dog's neck to take pressure off his throat. Unlike a muzzle, the nose loop still allows your dog to pant and bark. When a dog pulls, the Gentle Leader gently moves a dog's head and body back towards the handler. Available in 5 sizes, petite (under 5 pounds) through extra-large (130 pounds and over). The product includes fitting instructions and a comprehensive DVD.