I introduced him to the bit about a week ago and ever since then, he's become really spooky and resistant to everything we do. I started with an "O" ring snaffle and changed over to a bigger "D" ring because it kept sliding through his mouth when he played with the bit. My boss wasn't happy with how fast the horse was progressing so he asked me to change the bit to a short-shanked snaffle 3 days ago. So now the horse is progressing faster with the bit, but we're going backwards with almost everything else. He now spooks when I saddle him and it takes me at least 3 tries to get it over his back. He won't give me his head when I go to halter him, and it's even worse when I try to bridle him (obviously). My boss wants me to keep pushing through his training and and says that the horse will learn to deal with it if we stick to the routine, but I'm not so sure that this is one of those situations that gets worse before it gets better. I think we're just ruining the horse.