Twelve HDPE panels give this dog playpen enough perimeter to ring a wide area, and each joint rotates a full 360 degrees so the shape follows the room rather than forcing a square. Every panel measures 21-in by 31.5-in, tall enough that a mid-size dog thinks twice about the top rail. The 14.5-in by 30.5-in door carries double latches for controlled entry. Suction cup feet steady the pen on tile and laminate, while the included ground stakes anchor it on grass. Panels snap together without tools, and the 30-lb set breaks down for an RV, a campsite or a weekend away.