Basic Sciences Bldg. 2001 S. Lincoln Ave. That means any stallion. The reason for this warning is the fact that the male hormone testosterone increases aggressiveness.
Stallions are very territorial about their own personal space.
This aggressiveness could result in serious injury if precautions are not taken. He points out that some stallions which have been shown at halter become very aggressive if they perceive they are being threatened or may be physically disciplined. They may have experienced some fairly strict physical discipline to get them mannered and trained to show properly. Use special care when handling these horses. He also warns that owners or handlers should not get between a stallion and another horse the stallion is interested in, regardless of the other horse's gender.