Bob-A-Lot Multi Chambered Interactive Dog Toy by Starmark can be filled with treats or food in the top or bottom chamber, and must be manipulated by the dog's nose or feet to extract the goodies inside. Both the top and bottom chambers feature adjustable openings to regulate the difficulty in which the dog removes the treats. The toy holds up to three cups of food in a variety of sizes, and is a great way to feed and exercise your dog. The Bob-A-Lot is made from a durable polymer with an anti-slip coating on the bottom. One size is appropriate for dogs of all sizes. The small is ideal for dogs under 30 lbs and measures 7" tall and 15" around the largest point. The large is ideal for dogs over 30 lbs and measures 10" tall and measures 19" around the largest point. TREAT Dispensing Bob-A-Lot Holds Variety of Treats & Kibble Easy-to-Fill, Easy to Clean dual chambers allow you to fill Treats with kibble. Easily Customize Difficulty Level Adjust opening to control release of treats. Bobs and tilts on weighted, anti-slip base. Provides Hours of Challenging Play Puzzle releases treats as your dog paws, nudges and chases. Bob-A-Lot Directions Pour kibble and/or treats in top. Adjust the 2 openings for difficulty level. Treats fall out as your dog plays! Bob-A-Lot works well when filled with Simply Wild Pet Food.