Patent ID: 8141517

Claim:
A pet pen for housing a pet, comprising: a plurality of enclosing members that each have a wall body and an opening end, wherein the plurality of enclosing members form the pen by overlapping a portion of the wall body at two or more of the opening ends, and wherein the pen width is adjustable in the width direction at prescribed increments; a pen tray to be installed under the pen, wherein the pen tray is adjustable in the width direction at prescribed increments, and wherein at least some of the prescribed increments of the pen are the same as at least some of the prescribed increments of the pen tray; a first door provided in a portion of the wall body of a first enclosing member of the plurality of enclosing members, wherein when a portion of the wall body of a second enclosing member of the plurality of enclosing members overlaps with and creates a blockage of the first door, the overlapping portion of the wall body of the second enclosing member is movable to remove the blockage such that the first door is not obstructed; a second door provided in a portion of the wall body of a second enclosing member of the plurality of enclosing members, wherein the second door rotates about a horizontal axis, and wherein the second door opens by rotating upward about the horizontal axis; and a lock mechanism which is installed on the second door, wherein the lock mechanism functions as a lock when the second door is in a closed state, and when the second door is in an open state, the lock mechanism also functions to maintain the open state.