Litter box

FIG. 1 is a front, top perspective view of a litter box showing our new design;

FIG. 2 is a front, bottom perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a right side view thereof; the left side view being a mirror image of the right side view;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The features shown in broken lines are portions of the litter box forming no part of the claimed design. The features shown in long dash-short dash bolded broken lines on FIGS. 2 and 7 indicate the bounds of the claimed design and otherwise form no part of the claimed design.