4BFCrazy Bounce Ball size M is a medium dog toy with the same great features as our original Dog Bounce Ball. It’s a fun, safe, and interactive toy for dogs of all sizes.The durable rubber shell bounces unpredictably to keep your dog interested in playtime.The best part? You can fill it with treats! Made from non-toxic natural rubber that is completely safe.WARNING: Cancer and Reproductive Harm -www.P65Warnings.ca.gov