An Alabama miniature donkey named Emma, who has worn a series of prosthetic legs since birth, is providing valuable insight into how such artificial limbs could one day save horses, donkeys and other animals that, today, are often euthanized because of leg injuries or malformed limbs. Hanger Clinic, which has made all of Emma's prostheses, and Auburn University are examining how to develop a device that can flex like a real hoof and still bear Emma's weight.

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