Abstract: An exhaust and deodorizing system for an animal housing. The system features an exhaust unit provided with an air inlet operatively-connected to the interior of the animal housing. The exhaust unit further includes a replaceable filter, an air outlet and an electric fan. The fan is capable of moving a current of air from the inlet, through the filter, and then to the ambient area via the outlet. An important feature of the invention is a flexible mat that conforms to, and seals, the top of the animal housing. The mat includes a hole that can be placed in at least partial registration with a ventilation hole in the housing. The exhaust unit's inlet fits in, or on, the hole in the mat. It should be noted that exact registration between the exhaust unit's inlet and the ventilation hole in the housing's roof is not required.