Richell presents the Expandable Pet Pen, which virtually eliminates the need for a replacement pen because it can be enlarged as the animal grows, the company reports. Interlocking corners provide extra frame support, and a wire door allows for easy pet access, the company states. The hardwood pen expands from 35.4 in. to 60.6 in. and includes an expandable floor tray. A wire top and divider are sold separately.