Richell Expandable Pet Pen with Tray, Autumn Matte Perfect indoor containment for litters and adult pets Corners interlock for extra frame support; wire door provides easy access for pets Side door lifts for convenient access to food/water, doggy pads or floor tray Optional wire top provides additional pet security; optional divider separates eating/sleeping area from potty area Pen expands from 35.4 inches to 60.6 inches wide; adjusts to pet's growth pattern