A modular pet assembly having a pair of end members that define an opening sized and shaped for the entrance and exit of a pet. At least one end member is configured for wall mounting at a selected elevation. A lateral member interchangeably engages between the end members at a plurality of locations for arrangement of the modular pet assembly in a plurality of configurations. The pet assembly assembles into a configuration for accommodating a pet, and disassembles into a configuration for storage and shipping.
