I was given a 15 year old QH gelding named Pi this summer. He is something else to look at, I have never seen a non-stallion horse like him. About 16.1hh, piebald sorrel with one blue eye and has more muscle on him than any gelding I have ever seen. For a few months he was kept by himself, away from my other two geldings and mares. Eventually, we decided to let him in with my club-footed QH/App Tikki, Walker gelding Maverick and Anglo Arab gelding Beau who is always the omega horse. What became immediately apparent was that Pi was dead set on literally killing Beau if he came within 50 feet of him. Pi would go for Beau's head, back, neck, belly, until Beau ran to the corner of the field where Pi made him stay. So we removed Beau within the first 15 minutes, leaving Tikki and Maverick because Pi had had no problem with them. After waiting a bit to make sure that the three would do well together, I started cleaning out the water troughs and doing daily tasks. I returned a while later to find Pi trying to mount Tikki without much success, but he definitely tried 3 times. She gave him a good kick where it hurt, and he didn't attempt it again. Since then, he has exhibited many other stallion behaviours along with being so overly muscled. He does not tolerate men well and is extremely protective of his "mares" be those mares human or horse.
My vet has theorized he might be rigged, but from what I've read about them they are pretty aggressive. Pi is a real sweetheart and a joy to ride, but he seems to lose it sometimes and he gets really studdish.
He was born in Nebraska on a ranch, stayed there until he was 7 when he was brought to Georgia for some reason or another. He had one owner per year until 3 years ago when he previous owner purchased him for a dressage/schooling horse (which he was great at, he loves being around young girls) and then gave him to us when she no longer had room for him. He drives, and is a great dressage horse. It is unknown when he was cut.
Is there a difference between rig and proudcut? Is it possible to know if this behaviour is from him simply being cut late? Is there a good way to manage it? How do you know if a gelding is or not? And is it safe to show a horse that is like this? My mom is considering showing him western pleasure.