The Dogit Knot-A-Rope Bone is an all natural 100-percent cotton chew toy that provides great interaction with your dog. Also, clean your dog"s teeth the fun and easy way with the DogIt Knot-A-Rope Bone. Regular chewing gently cleans teeth and massages gums, reducing plaque build-up and preventing gum disease. Fun to toss, chew and fetch, Knot-A-Rope Bone provides hours of healthy play for you and your pet. The bone is made from biodegradable material and is machine washable.