The ornamental design for a horsegirth, as shown and described.
FIG. 1 is a perspective view of a horse girth;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a rear elevation view thereof; and,
FIG. 6 is a right elevation view thereof, the left elevation view being a mirror image thereof.
The evenly spaced broken lines shown around the edges of the claimed surface depict stitching and form no part of the claim. All other evenly spaced broken lines are for the purpose of depicting portions of the horse girth that form no part of the claimed design.
The unevenly spaced dash-dot-dot-dash broken lines represent the bounds of the claimed design.