Lifeunion Pet Hyperactivity Leakage Food Smarter Interactive IQ Treat Drain and Dental Chew Ball Dog Toy Made of hard plastic, durable and safe, non toxic, Diameter: 3.5".Uneven surface can massage the dog's teeth. Treat dispensing toy. Simply fill the ball with snacks and let your dogs have a fun time to have meal. Cultivate your pet's concentration and increase IQ while they are left alone during the day. Adjust difficulty level as your dog learns.Designed to be picked up and rolled. Rolls on the floor and treats spill out,ideal for small small dogs & cats.