Ancol Blue Bone Adjustable Dog Collar Ancol Blue Bone Adjustable Dog Collar – Give a dog a load of bones with the bright Blue Bone Collar! Featuring multi-coloured bone applique design applied to a sturdy collar made of nylon. Nylon is a strong, lightweight and weather-proof material that is durable and flexible, meaning a long-lasting collar that is comfortable for your dog. With a quick-release buckle for speedy removal and an adjuster to also ensure your dog’s collar is the perfect fit. Features a sturdy D-ring for easy lead attachment.