Temporomandibular joint dysplasia in an Irish Setter

Dysplasia of the temporomandibular joints was diagnosed in an Irish Setter. The condyloid process was mis-shapen and the glenoid fossa flattened, which allowed subluxation of the temporomandibular joints with recurrent locking of the coronoid process on the zygomatic arch with the mouth open. Permanent relief from open mouth jaw locking was given by partial zygomatic arch ostectomy.