Just kill one that is broomed, thus no sharp horns......LOL. I can't see any reason not to allow as carryon, makes sense to me. But if you get a booner it may not fit in the overhead so it would be disallowed cuz of size. But if that were the case what a good problem to have. I have transported several in my checked baggage(duffel) with no problem.
from the "Heartland of Wyoming"