Graced with the work of Pauline Napangardi Gallagher, this martingale collar will make a stylish statement on your sighthound's next walk. Designed for greyhound and sighthound other breeds, these martingale collars help control your dog on a walk without causing stress on their delicate necks. Our collars are made from cotton canvas that has been wrapped around nylon webbing and come in 4 sizes. Please measure up your dogs neck to ensure you choose the right size for your dog: Sizing (please measure your dog's neck to choose the right size) Small - 18cm to 28cm (2.5 wide) - Smaller Whippets Medium - 36cm to 42cm (4cm wide) - Larger Whippets Extra Large - 43cm to 55cm (4.5cm wide) - Big Greyhounds only Watch our demo video here to fit your dog: