My horse has become hard to bridle. The bit is fitted to him ok and he enjoys riding, he accept the saddle, and rider, he stands to be mounted does w/t/c with no problems and is not barn sour at all. I checked inside his mouth and he isn't sore or bruised. He opens his mouth to bridle and lets me start to slide it in and then slings his head up, and the bit goes clinkering on his teeth, he does the same thing when I try to take it out, I try to be extremely gentle but he immediately throws his head up and has been doing it since I got him. I thought it was just because I'm someone new but its been a month and he is only getting worse. It took me a half hour to get the bit in his mouth yesterday and I only got it in because my mom pulled the headstall up while I slipped the bit back so it wasn't hitting his teeth.
Bridling a horse should not be a two-person job.
I've tried approach and retreat. When he throws his head up the bit follows him and once he drops his head, it goes away. I did this for about a week with no changes.
I will take some video of me trying to bridle him, I hope it is something I am doing wrong so that I can figure this out.