Your pet will love the warmth and feel of this soft, comfy bed. It"s two layers of thick orthopedic foam will not "bottom out" for even the largest dogs. The bed"s unique heating system uses dual thermostats to pamper your pet with cushy comfort that"s just the right temperature. This bed is easy to care for, and the removable cover is washable. It"s great for dogs or cats of any size. It is available in 3 sizes. While this is perfect for cold months, many pets are chilly in the summer air conditioning and love this bed to keep them warm. But, even if you don"t use air conditioning, most pets love the feel of this bed, so all you need to do is remove or unplug the heater for use during warmer months. It is UL approved in both the US and Canada. Choosing the right bed size: While your pet is on the floor lying down, measure their body length from the base of their tail to the tip of their nose and add 6".