FIG. 1 is a perspective top view of a horse boot showing my design;
FIG. 2 is a perspective bottom view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a right-side elevational view thereof, the left-side being a mirror-image thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The blank portion contained within the broken lines in FIGS. 1, 5 and 6 forms no part of the claimed design.