(2 pack) starmark large bob-a-lot interactive dog toys starmark 2 pack of starmark large bob-a-lot interactive dog toys. allows your dog to eat and exercise at the same time. the large bottom chamber fits up to 3 cups of food - enough for a full meal. there are adjustable openings at the top and bottom to accommodate most types of dog food and allow you to regulate the difficulty level. the weighted anti-slip bottom makes the toy wobble erratically enticing your dog to play.