My 15 year old QH/Arab gelding is very twitchy. His skin twitches when you brush him, when you saddle him, when the reins hit the side of his neck, etc.
He does NOT like to be brushed.
He is great under saddle with no behavioral problems. The chiropractor was out Thursday and adjusted him but he is still twitchy.
I was wondering if magnesium might be helpful. I know that with people it helps but didn't know about horses.