Very cute boy!
He's built downhill, and a bit weak in his loin. His neck is short, which is what's making his back look long. He could use some muscle over his topline and in his hindquarters. He's sickled hocked in his hind end, and is a bit long and upright in his pasterns. He has low set knees in his front end.
He could be a little deeper in his flanks, but his sheath is set kind of awkwardly, so that's throwing me off a bit.
:) Like I said, he's adorable! Looks a bit crabby in the picture, but he's presented quite well!