Graced with the Indigenous artwork - Fire Country Dreaming by Nathania Nangala Granites with 10% of sales going directly back to the artist. Designed for greyhound and sighthound 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) Medium - 36cm to 42cm (4cm wide) - Whippets Large - 38cm to 46cm (4cm wide) Greyhounds Watch our demo video here to fit your dog