The ornamental design for a petaccessorypouch, as shown and described.
FIG. 1 is a front and side perspective view of a pet accessory pouch having its flap in a closed position;
FIG. 2 is a front and side perspective view thereof, having its flap in an open position;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a back elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a left side elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The features shown in broken lines represent environmental subject matter that are for illustrative purposes only and form no part of the claimed design.