The ornamental design for a dog harness, as shown and described.
FIG. 1 is a top-left perspective view of a dog harness showing my new design, in condition of use on a dog;
FIG. 2 is a top-left perspective view of the dog harness of FIG. 1;
FIG. 3 is a top-front perspective view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a left side elevational view thereof;
FIG. 7 is a right side elevational view thereof;
FIG. 8 is a top plan view thereof; and,
FIG. 9 is a bottom plan view thereof.
In the drawings, the broken lines showing dimensional elements on/attached to the harness (hardware, fasteners, straps) depict environmental subject matter only and form no part of the claimed design. The broken lines showing on the harness depict stitching and form no part of the claimed design. In FIG. 1, the broken lines showing a dog depict environmental subject matter only and form no part of the claimed design.