I have just broken a pony to harness, but he is holding his head and neck to the left all the time and falling out through the right shoulder. How would I go about correcting this? in ridden I would open up left rein, squeeze right rein and use plenty of right leg, but he doesn't do it ridden, only long reining and driving. Today was the first time I put him in. Will he straighten himself up do you think, or is there a way a to correct.