The ornamental design for a petenclosure, as shown and described.
FIG. 1 is an isometric view of a pet enclosure;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left hand side view thereof, wherein a right hand side view is a mirror image of the left hand side view;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is another isometric view thereof showing the frame without the screened confinement; and,
FIG. 8 is another isometric view of only the screened confinement portion.
The broken lines shown in the drawings illustrate the bounds of the non-claimed subject matter, are for illustration only and form no part of the claimed design.