Originally Posted by Chokolate
I've had a niggling question about studs for a while now, every since I began reading this board a year or so ago. Everybody refers to studs as dangerous, they would never keep one, how hard they are to handle, and things like that. I have no personal experience handling one (and don't think I want to until I have much, much more experience as a horse person if at all!) but have wondered what makes them so much more aggressive than a mare or gelding? When gelded, why do they become quieter and less temperamental? Why aren't mares the same as studs in levels of 'aggressiveness?'
Short answer: Testosterone.
Long answer: Studs can be just as pleasant and well trained as any other horse, but how often do you see people just throw a stud into a pen and use them only to breed? They go stir crazy, know how big and bad they are and end up with zero respect for people.