Graced with contemporary and colourful work of Keturah Zimran, this martingale collar will make an artistic statement on your sighthound's next walk. 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 Medium/Large - 38cm to 46cm (4cm wide) - Greyhounds Extra Large - 43cm to 55cm (4.5cm wide) - Big Greyhounds only Watch our demo video here to fit your dog: