mobile pen is easy to keep clean, has a slide-locking system on the door and top in addition to a lockable base and lockable casters. This will keep your favorite feline in hisher own private space, safe and secure. Cats enjoy lying in areas high off the ground so this enclosure has two elevated platforms for nesting or perching. The most advanced cat underground fence on the market today comes in a kit with everything you need to contain one cat in a yard up to 13 or 12 acre. With additional wire, flags and cat fence collars you can enclose yards up to 20 acres in size and contain an unlimited number of cats.