Thanks for all the great responses. I think you guys that talked about his black markings being scars are right because Rhett is very bossy around other horses and definitely won't back down from a fight! I've never seen him fight with another alpha type horse but I'm sure it wouldn't be a pretty sight (luckily my other horses don't challenge his authority) but apparently at some point in his life, he's fought a lot! I'm glad he's not bossy like that with people! Thanks for all the thoughts on what breed he might be. Does anyone else have any other info?
He looks like a mustang :)
Don't forget mustangs are decended from escaped horses, there is spanish, draft and arab blood in them somewhere. He does look draftish though.
Look at the noses on these mustangs to compare:
I think he is actually part Arab, and part draft. I think his roman nose is more pronounced because he has a dished face above it.
I agree with this statement, he doesn't have a traditionally "drafty" roman nose, there's just the bump that is emphasized because of his dished face. The "bump" almost looks as though it could have been caused by an injury, like rough use of a rope halter or hack to me. I think it's easy to assume draft cross because of how heavy he looks, but if he's only 15 hh the appearance is misleading. I too am leaning towards a mustang or mustang cross. A lot of the mustang herds in the Wyoming area had drafts turned out with them many years back. He might have draft in him, but I'd guess it to be 1/4 or less.