Nuts for Knots 2-Knot Rope with Tennis Ball will have your dog literally going 'nuts for knots'. Knotted at both ends with a tennis ball in the middle, this toy is great for tug-of-war, throwing and gnawing. This interactive toy will keep your pooch entertained for hours. The toy is tough, durable and is great for the tough chewers. Nuts for Knots 2-Knot Rope with Tennis Ball comes in various bright colors.