Riddle with the frightening answer

This truncated unhappy horse's hoof, which did not receive proper care for as many as seven years! These photos were taken in the German city of Bremen, where 16 horses were found.
The owner of this horror 43-year-old Bernd Christoph, had a total of twenty horses, but only four more or less normal. They are regularly out on the pasture, but 16 horses life has become a little hell in a closed barn. It all started after 8 years ago died blacksmith who are engaged in them, and Bernd found (or did not want to find) a replacement.