The KONG Wobbler(TM) is an action-packed toy that is a mentally stimulating food dispenser. The KONG shaped toy sits upright until nudged by the dog's paw or nose, dispensing tasty rewards as it wobbles, spins and rolls. The unpredictable movement stimulates natural instincts keeping even the most seasoned users challenged. The KONG Wobbler(TM) can also be used as an alternative to a dog bowl to help extend mealtime while providing exercise for your dog. Trying to get your dog to lose a few unwanted pounds? The KONG Wobbler(TM) is a great way to keep dogs moving while making them work for their food. Unscrews for easy filling and cleaning. Use the large Wobbler(TM) for medium to large-sized dogs.