On the Art of Horsemanship

And if several horses together are driven in this fashion, how can they possibly be kept from interfering with one another? But a horse that is accustomed to being led from the side will have least power of doing harm either to horses or to men, and will be in the handiest position for the rider should he want to mount quickly.

In order to put the bit in properly, first let the groom approach on the near side of the horse. Then let him throw the reins over the head and drop them on the withers, and next lift the headstall with the right hand and offer the bit with the left.

If he takes the bit, of course the bridle should be put on. But if he refuses to open his mouth, the man must hold the bit to his teeth and put the thumb of the left hand in the horse’s jaw. Most horses open the mouth when this is done. If he still resists, the man should squeeze his lip against the tusk; and very few resist when they are treated in this way.

The groom should also be instructed in the following points: first, never to lead the horse on the rein—that gives the horse a hard mouth on one side—and secondly, what is the correct distance from the bit to the jaws. For if it is too high up, it hardens the mouth so that it loses its sensitiveness; and if it lies too low in the mouth, it gives the horse power to take it between his teeth and refuse to obey.

The groom must also pay some attention to such points as the following: whether the horse will not easily take the bit when he knows that he has work to do. Willingness to receive the bit is, in fact, so important that a horse that refuses it is quite useless.