Recommended by veterinarians, this comfortable and therapeutic bed for small dogs has a gentle, even heating element that can facilitate recovery from an injury or illness, and soothe older pets with arthritis. An orthopedic foam mattress distributes weight evenly across the bed, eliminating pressure points that can cause stress to joints and muscles. The microsuede cover resists stains, moisture, and scratching, and the cover is machine-washable for ease of cleaning. Includes DC car adapter. Plugs into AC. Rechargeable battery (sold below) allows you use the bed where AC power is unavailable. Medium. For pets up to 20 lbs. 24" W x 20" L.