How do you know when its time to get rid of a bull? Mine bowed his neck and growled today with his tounge hanging out. When I threw a rock at him he barely moved off and stared at me like "I owed him money" Hes coming on three years old and has been pretty calm so far. Last year when I put him through the chute he didnt like it and after I turned him out he went the log way around to try and get behind me. How do you decide what is being too agressive?