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A 9-year-old 17.2-kg (37.8-lb) spayed female Shetland Sheepdog was referred to a veterinary dental center for evaluation of an oral mass affecting the left maxilla. The dog had been treated for a similar, although much smaller, lesion at the same location 14 months prior to this examination. The previous lesion involved the left maxillary fourth premolar tooth. On physical and radiographic examination 14 months earlier, this tooth was presumed vital on the basis of an apparently normal periodontal ligament space, lack of a periapical lucency, and a pulp cavity that was similar in diameter to