pastern

n. part of a horse's foot between the fetlock and hoof

The pastern is a part of the horse between the fetlock joint and the hoof, or between the wrist and forepaw of a dog. It is the equivalent to the two largest bones found in the human finger.
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Pastern in ungulates the segment of the limb between the fetlock and hoof, supported by proximal and middle phalanges; in dogs the metacarpal region. [more]Pastern - Community and Resources

Noun
1. the part between the fetlock and the hoof
(synonym) fetter bone
(hypernym) bone, os
(part-holonym) horse's foot, horse's hoof
(part-meronym) coronet

(n.)
The part of the foot of the horse, and allied animals, between the fetlock and the coffin joint. See Illust. of Horse.
  

(n.)
A shackle for horses while pasturing.
  

(n.)
A patten.