Collar - Martingale - Quick Release - Medium - Purple Made from heavy duty nylon webbing. These collars are made to prevent your dog from slipping out of its collar while being walked on a leash and can also be used as a training collar. The Martingale collar is often referred to as a humane choke collar. They feature a twin loop design that works by tightening around your dog's neck whenever it tries to remove its head from the collar. Then, the Martingale will loosen again when your dog stops struggling against it. The limited closure of the Martingale collar prevents it from becoming too tight. $ 8.00 | |