starmark bob-a-lot interactive dog toy (2 pack) starmark the bob-a-lot exercises and feeds your dog at the same time! dogs of all sizes are able to manipulate the toy to get food or treats out. the large bottom chamber fits up to three cups of food- enough for a full meal! adjustable openings at the top and bottom accommodate most types of dog food and allow you to regulate the difficulty level for your dog. the weighted anti-slip bottom makes makes the toy wobble erratically, enticing your dog to play.