The ornamental design for a “leg cover for horses,” as shown and described.
FIG. 1 is a top front perspective view of a leg cover for horses, showing my new design in condition of use;
FIG. 2 is a left side elevation view thereof;
FIG. 3 is a right side elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a front elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines showing a horse in FIG. 1 depict environmental matter and form no part of the claimed design. The broken lines on the leg cover in FIGS. 1 through 7 depict stitching that forms no part of the claimed design.