Our Petstages(TM) Focus Treat Ball can be filled with treats offering hours of calm concentration for your pet. Safe, durable rubbery material holds up to enthusiastic chewing. Challenges and entertains your dog for hours. Helps keep your dog still, through focused play. As dog breaks up treat inside of ball, pieces fall out of holes, providing reinforced fun. Fun to chew and play with even without a treat. Ideal for medium-large sized dogs.