I too feel there's something going on on her right side, besides the way the hind leg was moving, she prefers to turn her head to the right and from what I was seeing her right nostril was pulled higher. Have you checked her front hooves? Why I ask is because of the path of the nerves. Pain in the front travels up the leg then one route goes to the poll and the other towards the wither's area, along the back to the hind leg. Usually when lame on the front the horse will bob his head upward, yet downward with the hind. The bit is not why she's headbobbing as your reins were loose when you lunged her under tack.**A friend had been given a mare that was chronically "stiff" in the rt. Hind and continued for several years even with regular trimming. She found a good farrier who correctly balanced the old girl's hooves thro trimming only, and she was immediately sound. It was her front that was causing the issue yet she'd never been seen to limp on the front.
Last edited by Saddlebag; 01-24-2013 at 02:09 PM.