Abstract: A safe circular horse pen which is easily assembled and disassembled. The pen is constructed of multiple panels arranged end-to-end. Each panel includes a vertical pole with an L-shaped leg and six horizontal bars secured to the vertical pole at vertically spaced apart intervals. The unattached ends of the poles are hollow and each unattached end couples to the next adjacent panel by receiving a loop extending from the side of the pole of the next adjacent panel such that a bolt may be passed through a vertical opening in the unattached end to lock each horizontal arm to the pole of the next adjacent panel. The individual panels may be nested in pairs for storage and shipping.