Definitions for "Withers"
Keywords:  shoulder, neck, blade, ridge, dog
The ridge between the shoulder bones of a horse, at the base of the neck. See Illust. of Horse.
The point where the leg joint meets the top of the back of a dog is called the withers. They are also known as the shoulder.
The part between the shoulder bones at the base of the neck; the point from which the height of a dog is usually measured.
Withers (earlier variants Wither, Wyther) is an English surname of Anglo-Saxon origin. It is today a not uncommon family name throughout the Anglosphere.
sensibility to trouble (as in the phrase `wring one's withers'); "the lawsuit was wringing his withers"; "our withers are unwrung"--Shakespeare
The reason you'll seldom see a man riding bareback.