The ornamental design for a protectiveitem for horses, as shown and described.
FIG. 1 is a front elevational view of a protective item for horses showing our new design;
FIG. 2 is a right side elevational view thereof; and,
FIG. 3 is a left front perspective view thereof.
The structural features depicted by broken lines in the drawings have been shown for the purpose of illustrating portions of the protective item for horses that form no part of the claimed design.