The Kong Stuff-A-Ball is a treat dispenser that will keep your dog physically and mentally stimulated. The hollow inside holds treats or biscuits, while the outside holds paste-style treats and toothpaste. As your dog tries to get at the treats and paste, the Dental-Ridges clean his teeth and massage his gums. The Kong Stuff-a-Ball dog toy can reduce boredom, separation anxiety and other destructive behaviors. The small-sized Stuff-A-Ball is recommended for medium dogs, such as Chihuahuas, Pomeranians, Yorkies and other similar sized dogs.