fetlocks

noun
  1. The joint in the hind leg of a horse or other hoofed animal between the cannon bone and the pastern bone.
  2. Usage: Usually used in plural when referring to multiple animals or both legs of one animal.
  3. The tuft of hair that grows on the back of this joint in horses and similar animals.
  4. Usage: Refers to the long hair visible at the back of the fetlock joint.

Examples