The Medium Heated Dog Bed by Allied Precision is made of durable canvas. Each heated dog bed comes with a removable Pet Bed Warmer. This allows the Medium Heated Dog Bed by Allied Precision to be used year-round. The heating unit is only 12 watts at 25 volts. The voltage is low enough to eliminate any shock hazard. Older dogs will especially enjoy the added warmth that a heated dog bed will provide.Large Heating Element that Surrounds your dog et with Warmth.Low voltage for safety (24 volts).Low power consumption (12 watts).Size: 28" x 28".