ZippyPaws Pig Pen Burrow Toy with 3 Pigs, Plus 3 Extra Pig Refills ZippyPaws Pig Pen Burrow Toy with 3 Pigs, Plus 3 Extra Pig Refills Interactive puzzle toy challenges your dog Keeps your dog entertained and occupied Pig Pen size: 7 x 5 x 5 Inch Great for small and medium-sized dogs