My normally quiet gelding was a panicked mess trying to get away because he was so sore and stiff, but after a few adjustments to his major problem area, I saw his eyes soften, his head dropped, and he just heaved the biggest sigh of relief. After she adjusted his neck he kept swinging it from side to side as if he were saying, "Look, Mom! I can move my neck now!" The vet thought he had probably spent most of his life messed up and sore.
His movement has improved so much, and today he worked under saddle for the first time in four months! Now we just have to work on getting rid of that QH belly.
I'll post comparison photos and video tomorrow.
The moral of the story is if you're on the fence about getting your horse adjusted, let me say it was the best $100 (plus $75 farm call fee) I have spent on him.