The ornamental design for a dog harness, as shown and described.
FIG. 1 is a top, rear, left side perspective view of a dog harness, showing my new design in a first configuration.
FIG. 2 is a top plan view thereof.
FIG. 3 is a bottom plan view thereof.
FIG. 4 is a left side elevation view thereof, the right side elevation view thereof being a mirror image.
FIG. 5 is a rear elevation view thereof.
FIG. 6 is a front elevation view thereof.
FIG. 7 is a left side elevation view of the dog harness of FIG. 1 in an alternate configuration, having the front end wrapped over itself to form a loop; the right side elevation view being a mirror image.
FIG. 8 is a top plan view thereof; and,
FIG. 9 is a top, rear, left side perspective thereof.
The broken lines in the drawings depict portions of the dog harness that form no part of the claimed design.
The drawings are shaded to indicate contrasting surfaces.