BRACHYGNATHISM

Condition wherein the lower jaw is shorter than the upper jaw, placing the lower incisor teeth farther behind the upper incisor teeth.
Found on http://www.thehorse.com/Glossary.xhtml?L=B

Brachygnathism

Brachygnathism or Parrot Mouth as it is often called, refers to uneven alignment of the upper and lower teeth. In serious cases, the upper teeth protrude beyond the lower teeth. Problem with parrot mouth occur if the molars at the back of the mouth are also uneven, resulting in large hooks forming on the upper molars and the rear of the lower back
Found on http://en.wikipedia.org/wiki/Brachygnathism
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