Have it standing in a favourable position for starting

Have it standing in a favourable position for starting

As soon as he performs rightly, hitch him in an empty waggon; have it standing in a favourable position for starting. It would be well to shorten the trace-chain behind the steady horse, so that, if it is necessary, he can take the weight of the waggon the first time you start them. Do not drive more than a few rods at first; watch your jibbing horse closely, and if you see that he is getting excited, stop him before he stops of his own accord, caress him a little, and start again. As soon as they go well, drive them over a small hill a few times, and then over a larger one, occasionally adding a little load. This process will make any horse true to pull.

Fonte: Tamming Horses