So far as this gait is the result of training, it can be corrected, though with difficulty. But if it is hereditary, it can seldom be changed. I have myself had occasion, in the United States, to alter a good many amblers into trotters. My own method is by cavesson and breaking-strap, a tiresome device, but fairly quick and sure. The progression through the reasoned equitation is the best corrective; but this also is very tedious, since the work must be done, partly on foot, and partly mounted in place. Even then, if the horse is put to the trot and begins to amble, he must be stopped at once, lest he become confused and not understand what is asked of him.
The rack is between a walk and an amble. The four limbs advance by a lateral motion, slower than at the amble, faster and shorter than at the walk. But in order to do this, the muscles of neck, back, loins, and haunches have to be kept contracted, so that the entire vertebral column is held immobile. This is especially noticeable in the pelvic region and at the coupling. The hind hand receives no trajection as in the walk and trot. The rear limbs move below the croup without any lift-and-drop at each step. The sacral region remains rigid. The stride is short and quick.
The front legs are neither completely in lateral, nor yet completely in diagonal. Each reaches forward and returns supporting the load, a little in advance of the rear limb on the same side. But
