As usual, Joe-Joe & I are in agreement. Instead of trying to get the halter actually on him, work on draping various things, including the halter across his head , starting low down and slowly, over days moving higher, with lots of verbal rewards when he allows you to touch any part of his head. Treats as rewards are also useful, but concentrate on verbal rewards. As he grows older, and you start riding him, you will need him to respond to verbal praise and rewards – – treat rewards can be awkward to give when you on his back. Work on him allowing you to touch the rest of his body as well, always keeping in mind that he has to see you as head horse of his “herd”, so you also need to use verbal reprimands when he is not cooperating. Once he accepts you as head horse, everything gets easier, and he will be safer to work with.