This activity ball mentally and physically stimulates dogs by appealing to their natural prey and stalking drives. The customizable dual Treat Meters™ randomly dispense kibble and treats as the ball tumbles around. Rubber bumpers minimize noise and marks on walls and floors. Each toy is appropriately sized to hold a dog's entire meal. Unscrews for easy loading and quick clean-up. Size: Medium/Large, for dogs > 20 lbs (Spaniels, Shelties, Labs, Rotties, etc.)