Selectively closable vents are provided in the lower corners of the rear wall of an animal housing unit, adjacent the corners where the rear wall joins the side wall. The animal housing unit comprises an enclosure formed by a front wall, a rear wall opposed to the front wall, two opposed side walls extending between the front wall and the rear wall, and a roof spanning the walls. The enclosure further comprises a base remote from the roof and adapted to support the enclosure on a surface. A doorway is formed in the front wall, and at least two selectively closable vents are in the rear wall adjacent respective junctions between the rear wall and the side walls. Each of the vents includes at least one vent aperture positioned less than about 24 inches from the base.
