Pet Play Pen

FIG. 1 is a left, top, front side perspective view of a pet play pen, showing my new design; FIG. 2 is a right, bottom, back side perspective view thereof; FIG. 3 is a front elevational view thereof; FIG. 4 is a back elevational view thereof; FIG. 5 is a bottom plan view thereof; FIG. 6 is a top plan view thereof; FIG. 7 is a left side elevational view thereof; FIG. 8 is a right side elevational view thereof; FIG. 9 is an enlarged view of the portion labeled “ 9 ” framed in FIG. 1 ; FIG. 10 is an enlarged view of the portion labeled “ 10 ” framed in FIG. 1 ; FIG. 11 is an enlarged view of the portion labeled “ 11 ” framed in FIG. 1 ; FIG. 12 is an enlarged view of the portion labeled “ 12 ” framed in FIG. 2 ; FIG. 13 is an enlarged view of the portion labeled “ 13 ” framed in FIG. 2 ; FIG. 14 is an enlarged view of the portion labeled “ 14 ” framed in FIG. 2 ; FIG. 15 is an enlarged view of the portion labeled “ 15 ” framed in FIG. 5 ; and, FIG. 16 is an enlarged view of the portion labeled “ 16 ” framed in FIG. 5 . The dot-dash broken lines in the figures define boundary lines of the enlarged areas that form no part of the claimed design.