Don't know anything about Dressage, but as a western horse he looks good. I like his sloping shoulder, long forearms, short cannons, medium pasterns and a deep flank. He should have alot of stopping power. Take a look at his chest, you don't want it to be to wide, nor too narrow. Also watch his walk, if his back foot steps over the front track , then that would be a very good thing. Look to see that he is overall balanced and pleasing to look at. You will want a short back, and high withers. Im not a pro, its what I would look for.