Designed with versatility in mind, the FurHaven Outdoor Convertible Orthopedic Pet Bed features a removable top panel and a water-resistant bed base. This plush and cozy pet bed allows for the addition of heating or cooling pads in the space designed for the top panel. This bed is easy to wash and provides aging dogs with an even distribution of weight to relieve joint pain. Dimensions:Small: 15L x 20W x 3.5H in. Medium: 30L x 20W x 3.5H in. Large: 36L x 27W x 3.5H in. Jumbo: 44L x 35W x 4.5H in. Multiple size options available. Top panel constructed from plush fabric. Water-resistant polycanvas base. Easy step-on for older/disabled pets. Top panel zips on/off to keep your pet warm. Machine washable.