Greyhound Collar

http://www.collarplanetonline.com/dog-collars/christmas-argyle-nylon-martingale-chain-limited-slip-loop-dog-collar/
Christmas Argyle Nylon Martingale Chain Limited Slip Loop Dog Collar. Our Martingale Collars provide the convenience of adjustable sizing with the safety of a limited range of choke collar action. Collar size adjusts as pressure is applied to the leash. A martingale collar is also know as a limited slip collar or a safety collar.