A lightweight, collapsible pet house includes a lower frame which supports a raised pet supporting floor and an upper frame cooperable with the lower frame and removable with respect thereto which supports a cover forming the roof and walls over the floor of the pet house. The lower frame and pet supporting floor can be used alone as a pet cot. The pet supporting floor is preferably made of a mesh material to promote air circulation around an animal resting on the floor and a vent in the roof and an entrance to the house promote air circulation through the house. The frames are advantageously made of PVC piping and connectors for the piping so can be easily assembled and disassembled so the house can be easily transported and stored and the floor and cover easily cleaned.