The solid square, PVC lined canvas bottom will fit all MidWest Homes for Pets and New World exercise pens. This canvas bottom will fit most other metal foldable dog exercise pens as well. Adding the square canvas bottom is perfect for dogs, rabbits, guinea pigs and other pets. The solid bottom will help contain messes, fur, treats and toys. This solid bottom in the octagonal shape can only be used with the dog playpen when set-up in a square configuration. Please note the canvas bottom is sold separately. The dog playpen and top mesh sunscreen must be purchased separately from the canvas bottom. Please note, always supervise your pet while using the dog playpen or outdoor exercise pen.