Breeders, pet owners, and veterinarians have been using lectro-kennels to warm pets for more than 40 years. Sleek, smooth design is now more comfortable and durable than ever. Constructed of rugged abs plastic with a steel wrapped cord the lectro-kennel can lie flat on the doghouse floor. An internal thermostat heats to complement the body temperature range of your pet. Comes with a free removable, washable fleece cover. For indoor or outdoor use. One year limited warranty.