A portable litter box for a cat or other domesticated animal comprises a housing having upper and lower sections detachably securable to provide a substantially closed container. The sections are stackable or nestable for storage, shipping and/or display. Preferably, the upper section includes an opening for ingress and egress to the housing and a carrying handle for the box as well as means for holding a freshener; the lower section may include skid resistant feet. Pins are provided for detachably securing the sections together in assembly.