OK...I know that normal horse manure should break easily, and be greenish in color. Well, I haven't been able to get out to my horse because of my leg, but my mom went and fed for me this morning. She noticed that his manure was black in color, and fairly hard (didn't break apart easily). What does this mean??????? Should I be concerned???? I'm so mad that I can't get out there to see it for myself!!! Please help me! I'm so worried!