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摘要

A 2-year-old sexually intact male Labrador Retriever weighing 34.6 kg (76.12 lb) was evaluated because of unilateral right-sided nasal discharge of approximately 3 days' duration. Head trauma as a result of a fight with a larger dog was reported at approximately 1 week of age, resulting in the eventual enucleation of the Labrador Retriever's right eye at 4 months of age. There was extensive soft tissue damage to the orofacial region, including trauma to the oral cavity at the level of the gums and surrounding mucosa. It was unknown whether the dog's deciduous right maxillary canine tooth had ever erupted; however, as noted on subsequent physical examinations, its permanent right maxillary canine tooth never erupted. The dog was reportedly healthy until 7 months prior to evaluation. At that time, halitosis was noticed and extraction of a necrotic right maxillary fourth premolar (carnassial) tooth was performed. Treatment with trimethoprim-sulfamethoxazole after extraction temporarily resolved the halitosis. An episode of right-sided epistaxis and a low platelet count (16,000 platelets/(xL) were documented at that time; therefore treatment with the antimicrobial was discontinued. The platelet count returned to within reference range 1 week later. Approximately 5 days later, the dog developed right-sided green nasal discharge of mucoid consistency.