We claim the ornamental design for a dog clutch, as shown and described.
FIG. 1 is a top perspective view of a dog clutch of the present invention;
FIG. 2 is top view thereof;
FIG. 3 is a bottom view thereof; and,
FIG. 4 is a first side view thereof, wherein the second, third, and fourth side views are mirror images thereof.
The ornamental design which is claimed is shown in solid lines in the drawings. Any broken lines in the drawings are for illustrative purposes only and form no part of the claimed design.