What do you think he is?

He was gelded in August, vet at that time said he was about 1 1/2 years old. He's got kinda a roman nose. He maybe a bit more than 12h (he is little, would say no more than 13h, but I couldn't find my tape to give him a better guesstimate) but I also suspect he was a bit stunted.

Where he was found, predominate breed are Tennessee walker, and quarter horses (and paints). Ponies aren't that popular here, but I agree he is looking more "ponyish" these days. The only ponies I've really heard of around here are "pony of America", occasionally a welsh or welsh cross, but again, ponies are that common.

Ah, ok, I know there's some variations of shading but just seemed more pronounced than what I've seen, didn't know if it made any difference. He really gleams in summer, looks really nice. I can't wait til this summer when he sheds out and has gained weight.

My best friend's Arab is brown, but has a distinct "dorsal stripe" (really just counter shading). For a while, until she realize that there is no dun gene in the Arab breed, she was convinced he was a dun because he had a "dorsal stripe." If the horse has no dun factors other than a "dorsal stripe" (leg barring, diluted coat color, cobwebbing on forehead, etc), it cannot be dun.
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I didn't think he was dun, but since I am no color expert figured I'd see if it made any difference.

Found my tape, looks like he's right at 12.2 h (no concrete, no stick). He hasn't gotten any taller since August (just wider), but I suspect he might be getting into a growth spurt, as his butt seems to be getting a bit taller.

He also carries his tail pretty high. Here is a picture, taken today that shows that a bit better (he was swishing his tail a bit in other pics, when he does that he'll "pin" it down more, and it looks more normal) but when relaxed it is higher. For the longest time (til I got used to it) I was consistently thinking he was about to lift it to poo, or passing a lot of gas, ha.

Again, may not make and difference, I just don't see most others carry it that way, it's usually the opposite- higher when swishing, relatively flat when relaxed.

(Wind is blowing it sideways, taken with phone so not the best quality)