Dogit Striped Cotton Spiral Tug with Tennis BallThese durable Dogit Knotted Rope toys provide hours of fun and exercise, as well as helping to contribute to your dog? s dental hygiene. As your dog chews the toy, the cotton fibers gently clean the teeth and gums, helping to reduce plaque build up which can lead to gum disease. Made from natural biodegradable materials, machine washable. Dogit Knotted Rope Dog Toy, Multicoloured Spiral Tug with Tennis Ball. Multicolored Spiral Tug (blue, lime, white)