It's funny - when I compare the pictures, I see little similarity at all. The horse on the left has a narrow chest, narrow rump, shorter back, smooth muscling, cresty neck with a big jaw (even for a stud) - it has a very "Spanish" look about it (and rather than big feet, I see long feet that need a trim). The horse on the right has a broad chest, wide butt, massive muscling on relatively large bones, almost no crest on the neck at all and half again as much back (particularly in the loin) - other than them both being relatively small horses, they don't have a lot in common.I looked up a kiger mustang stallion and started comparing pictures, and I do see where she's coming from now. He has the neck/mane that comes far down, deep chest, short back, big feet, feathering, and although he's not dun, he does have a stripe down his back. I still think it's a long shot, but it's kind of fun trying to figure him out!