Original Red KongŪ Toy. Satisfies a dog's natural need to chew and cleans teeth and conditions gums! Made with super-bouncy, puncture-resistant natural rubber; dogs love it! Jawrobics' fitness and fun for dogs; world's best dog chase & chew toys! Stuff with your dog's favorite treats! Five chewer friendly sizes are available to satisfy dogs with typical chewing temperaments. Sizes: Small-3"L, Medium-3-1/2"L, Large-4-1/4"L, X-Large-5"L and King- 6"L.