The ornamental design for a petwastereceptacle, as shown and described.
FIG. 1 is a perspective view of a pet waste receptacle, showing my new design shown in environmental use;
FIG. 2 is a perspective view thereof;
FIG. 3 is a right side elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a front elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines in the figures illustrate portions of the pet waste receptacle that form no part of the claimed design. The broken line showing of a dog in FIG. 1 illustrates environmental subject matter that forms no part of the claimed design.