I found this totally fascinating. I’d always thought of the fetlock as the ankle, but this actually makes more sense.
So the hock is the ankle, and the stifle is the knee.
Though, the longer I look at this, the more I get uneasy all over again about how fragile horse’s legs are.
beljoeor.com 
Omg. That totally creeps me out. But it’s true!
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Oohh finally a perfect visual for me to share when I’m trying to explain this to people! Great find – thank you so much for sharing!
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haha yes, you always need to keep in mind that the hooves are the fingertip/nail and everything else is just a crazy mishmash of the rest of the arm.
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