I claim the ornamental design for a cross harness, as shown and described.
FIG. 1 is a perspective view of a cross harness, showing my new design in a deployed configuration;
FIG. 2 is a front elevational view thereof in a flat configuration, the left-side elevational view being a mirror image thereof;
FIG. 3 is a right-side elevational view of FIG. 2, the rear elevational view being a mirror image thereof;
FIG. 4 is a top plan view of FIG. 2; and,
FIG. 5 is a bottom plan view of FIG. 2.
The broken lines on the cross harness are understood to represent stitching.
The dog and leash depicted by broken lines in FIG. 1 have been shown for the purpose of illustrating environment that forms no part of the claimed design.