Brachygnathia (overshot, short lower jaw, or parrot mouth in horses) is manifest when the mandible is shorter relative to the maxilla. It can be found to varying severity and incidence in all species of animals. In cattle, it is inherited as a polygenetic factor and can be associated with other anomalies such as impacted molar teeth and osteopetrosis or with chromosomal aberrations such as trisomy, which is lethal. Diagnosis is through careful oral examination. Treatment varies from none to various orthodontic or endodontic procedures, depending on severity.
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