Way back when my horse was quite young (he's 12 now), he did the
unthinkable. He attacked a lamb, picked it up and shook it. I was
absolutely irate.
Did you see the provocation? Maybe the lamb was doing something
really awful, like pooping on some succulent grass the horse had his
eye on. Maybe he gave the horse the finger, uh, the, uh, toe. Maybe
the horse was simply in training-young-sheep mode.