Im helping my neighbor with her pony, and we tried to get him to join up the other day. I had read a lot about it, and I knew what signs to look for. So we start, and he NEVER dropped his head, he NEVER started 'licking and chewing' and NEVER turned his ear to us. We finally stopped, because he was really sweaty.... are there other signs to look for?? I read that every horse will eventually join up, but he never did. We worked with her other pony, and he got it right away, even though he's younger. HELP!