Keep your dog's teeth healthy and clean with the NERF DOG Spikey Ball! The spiked ridges clean teeth as dogs chew. You can provide extra enticement by adding a little of your dog's favorite sticky treat to the toy (we recommend protein-packed peanut butter). The spikey toy is molded in durable thermoplastic rubber, making it extra strong, so it'll stand up to extended chewing. Textured ridges make it great for toss and fetch, too! Recommended for medium to large dogs. Promotes Healthy Gums! Fun Bright Colors. Great for Heavy Chewers