Tha
Glossary
Goat Knees

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Over at the Knees
Carpal or tarsal joints (hocks) are incompletely extended (buckled) causing the limb to be angled forward, and the joint to protrude.
Explicit fault in many dog breeds (e.g. Basset Hound, Border Terrier and Dachshund).
Also known as knuckling over and (colloquially) as buck-kneed and goat-kneed.