What is claimed is the ornamental design for a mobility aid for quadrupeds, as shown and described.
FIG. 1 is a perspective view of the mobility aid for quadrupeds according to the present invention;
FIG. 2 is an enlarged close-up perspective view of the mobility aid for quadrupeds;
FIG. 3 is a front view of the mobility aid for quadrupeds;
FIG. 4 is a rear view thereof;
FIG. 5 is a side view thereof;
FIG. 6 is an opposite side view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
The broken lines throughout the drawings depict exemplary elements of the mobility aid for quadrupeds that are shown for illustrative purposes only and that form no part of the claimed design.