A cat litter box has a bath tub form having a circumferential lip having an underside, a raised perimeter extending upwardly from the lip, the raised perimeter having top edge, and a circumferential groove on the underside of the lip, a lid having an aperture therein, the lid configured to fit within the raised perimeter and rest on the lip, the aperture configured to permit ingress and egress of a cat, and a plurality of fasteners having an upper appendage and lower appendage, wherein the upper appendage is configured to extend over the perimeter, and the lower appendage comprises a protrusion configured to engage with the groove. The lid may also have a grate that is porous, or it may be textured and porous, to help remove litter from a cat's feet as it comes out of the litter box.
