Patent ID: 8434264

Claim:
An animal door having an adjustable height, said animal door comprising: a frame having a first frame perimeter side and a second frame perimeter side, said frame having first and second frame surfaces to define a passageway a first distance from the first frame perimeter side and a second distance from the second frame perimeter side, the first distance not being equal to the second distance, said frame being removably installable at a structure having a first structure surface and a second structure surface opposite the first structure surface that define a through-opening, the first frame surface being installed to the first structure surface and the second frame surface being installed to the second structure surface, an animal being able to pass through the through-opening by way of the passageway when said frame is installed at the structure, said frame being installable at a first orientation and a second orientation without modification to the through-opening such that the first and second frame surfaces are respectively maintained at the first and second structure surfaces at both the first and second orientations, the first distance defines at least a portion of a height of the passageway when said frame is installed at the first orientation, the second distance defines at least a portion of the height of the passageway when said frame is installed at the second orientation, the height of the passageway being the distance between the passageway and a surface traversed by the animal, the difference between the first distance and the second distance being equal to the difference between the height of the passageway when said frame is installed at the first orientation and the height of the passageway when said frame is installed at the second orientation.