Abstract: A one-piece cardboard house for an animal or pet, comprising a bottom panel constituting the floor, front and rear panels, and two side panels, each of the latter four panels being integral with the bottom panel, and forming the four walls of the house. A pair of roof panels forms a peaked roof, and the panels are also integral with one another and with one of the side walls of the house. The free edge of that roof panel which is opposite the integral side wall is joined to the other side wall by a unique releasable fastener arrangement. The front panel has a large notch at its top edge portion which partially defines an entrance passage to the house, with other parts of the entrance passage being defined by the edge portions of the two roof panels. The arrangement is such that the house can be stored or shipped in a flat or collapsed condition, and thereafter readily assembled by the consumer.