The inventive pet shelter described herein overcomes these drawbacks. The pet shelter has a non-deformable steel cage defining a space therein suitable for the enclosure of a pet and deformable pieces removably attachable to the perimeter of the steel cage. The steel cage has a top shelter section and a side shelter section formed by a guide following door, wherein the guide following door can be recessed into the pet shelter and underneath and adjacent to the top shelter section. The deformable pieces are oriented on corners and edges of the steel cage.