Meet the Kitty Tube: an insulated cat house that keeps your pet warm and comfortable outside. It comes with removable clear flap door and provides space for up to 3 cats. The floor, walls, and roof are all insulated. The Kitty Tube is made from recycled materials.
The Kitty Tube has a removable top lid and a comfortable pet bed. The door lets your cats through but keeps dogs and other larger animals out. Not cheap though.