Abstract: A freestanding enclosure for temporarily retaining large animals has a frame including four upstanding corner posts with a plurality of vertical posts horizontally spaced between each upstanding corner post. A plurality of horizontal cross rails are vertically spaced and extend between each upstanding corner post and vertical post to form an area of retention. Connectors releasably secure the horizontal cross rails to the upstanding corner posts and vertical posts such that the enclosure can be easily assembled, disassembled, transported and stored. A plurality of panels block the openings formed in the frame. A door provides access with the area of retention.