An apparatus for grooming cats which includes a source of food located in an enclosure and a grooming brush assembly forming an adjustable aperture which is mounted between a portal formed in the enclosure and the source of food. Thus, only print cartridges particularly configured and intended to be used in the printer will fit into the printer and enable its operation. The bounding cube is divided into a plurality of voxel elements. The activation of the suspend control mode includes adjusting an inlet valve and an exhaust valve of the pilot device, and suspending control of the inlet valve and the exhaust valve. The second subscriber control packet also may include a payload indicating a delay period for a subscriber radio to wait before making an attempt to register with a different trunking site. The container is so dimensioned that the discharge doors in their closed and open positions are shielded from an animal feeding from the apparatus.