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Craniomandibular osteopathy is a developmental disease in dogs causing extensive bony changes in the mandible and skull. It usually occurs between the ages of 3 and 8 months. Breeds most commonly affected include the West Highland White Terrier, Scottish Terrier, Cairn Terrier, and Boston Terrier. Symptoms include firm swelling of the jaw, drooling, pain, and difficulty eating. It is an inherited disease, especially in Westies, but canine distemper has also been indicated as a possible cause. Growth of lesions will usually stop around the age of one year, and then shrink. If the disease is extensive, especially around the tympanic bulla (middle ear), then the prognosis is guarded.
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