I have been told I look Arabian, yet I am gaited like a paso fino. I am 14.2, my previous coggins says I am a quarter horse. The current vet put down Arabian/paso fino, but didn't have a clue. Everyone I meet has a different answer.
What gaits does he do ? Your pics show a trot and gallop/canter.
He could be a quarter x paso or Arab x quarter .. or maybe even a little morgan x. I had a reg. Paint that single footed, he was taught to single foot. (not by me)