Abstract: A pet door protection apparatus for movable placement adjacent to an existing pet door, the collapsible apparatus having a first end and an open second end, the base having an adjustment plate and mechanism for adjusting the height of the interior floor, which is fitted atop the adjustment plate. The apparatus further provides a transparent side panel removably and vertically fitted within each groove of the interior base, each of an opposed pair of transparent roof panels hingedly attached to one of the side panels, respectively, the roof panels further hingedly attached to each other, a pair of opposed transparent triangular roof end panels vertically fitted between the roof panels, a protective cap fitted atop the hinged attachment of the roof panels, and a strip anchor with a plurality of weighted flexible transparent strips selectively fitted to the first end of the side panels.