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A 6-year-old spayed female Chesapeake Bay Retriever was presented to the authors’ institution for a 1- to 2-month history of melanic diarrhea, intermittent vomiting, and weight loss, with 2 days of hyporexia. Prior to presentation, the dog had been treated symptomatically with metronidazole, maropitant, and sulfasalazine with no clear improvement and had tested negative for intestinal parasites by means of fecal flotation.
On presentation, the dog was quiet and alert with a distended abdomen and mildly increased respiratory effort. The dog had a mild neutrophilia (segmented neutrophils, 2.2 X 109 cells/μL; reference range, 3.5 X 109