The JW® Gnawberry Chew-ee Dog Toy is a treat dispensing toy with scrubber knobs on it to provide dental cleaning while your dog chews. Tuck treat inside the blueberry knobs. The scurbber knobs move in and out dispensing treat. Fill the knobs with kibble to use as a puzzly slow feeder.The toy rolls and teeters unpredictably. Great for dogs small to large.