I claim the ornamental design for a cat litter box enclosure ottoman, as shown and described.
FIG. 1 is a Perspective view of a cat litter box enclosure ottoman showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a right-side elevation view thereof;
FIG. 5 is a left-side elevation view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is another perspective view thereof, shown in an alternate configuration, wherein the lid has been removed and the body is in a folded position.
The broken lines in the drawings depict portions of the cat litter box enclosure ottoman that form no part of the claimed design.