I tend to think of Rio as a Heinz 57 horse. I think he's probably got a lot of various breeds in him. "Grade" I think is the term I've seen. However, I keep having people tell me he looks like an Arabian. To me, I don't see it. He is tall and very narrow. Looks completely different in every respect to our known quarter horse. The neighbors breed arabs and to me Rio just doesn't have that face shape I've come to associate with them.
Here's probably the best pic I have of him now that he's been really filling out this summer. Still has a fair bit of weight to gain, but I think this is a fairly accurate representation of his shape.
What do you guys think?
ETA: The wind was blowing his mane and tail around. He doesn't just hold his tail up like that.