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except that "pace," ambiguous in this sense, had better be kept to mean all the gaits of a horse, and not restricted to a particular one.
When a horse, already at a fast trot, is urged to move still more rapidly, so that action in diagonal
SINGLE-FOOT
biped becomes impossible, he may change to the amble. For this, he stiffens the spine, and replaces the up-and-down motion of the trot by an oscillation from side to side in lateral biped. Fore and hind legs on the same side advance together; but the motion is so rapid that the animal appears to the eye to be running with the hind legs and
