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An approximately 12‐year‐old female Vietnamese Pot‐Bellied Pig was presented to the Mississippi State College of Veterinary Medicine Food Animal Service for anorexia of 2 days duration. On physical examination, the patient appeared depressed and lethargic with significantly pale mucus membranes, open mouth breathing, and nostril flaring. On abdominal palpation, the abdomen was tense and uncomfortable. A complete blood count (CBC) and chemistry profile were performed. The CBC revealed significant anemia and mild leukocytosis characterized by mild neutrophilia with a left shift. Mast cells were rarely observed. Hematocrit = 8.1% (RI 22‐50), RBC = 1.25 × 106/μL (RI 3.6‐7.8), WBC = 19.85 × 103/μL (RI 5.2‐17.9), Neutrophils = 15.08 × 103/μL (RI 0‐11.4), and Bands = 0.993 × 103/μL (RI 0‐0.019). The chemistry profile was unremarkable with a mildly elevated BUN and slightly decreased total protein and albumin (BUN = 39 mg/dL [RI 4.2‐15.1], total protein = 6.2 g/dL [RI 6.6‐8.9], and albumin = 2.5 g/dL [RI 3.6‐5.0]). An abdominal ultrasound revealed numerous hypoechoic nodules diffusely scattered throughout the hepatic parenchyma. An FNA of one of the hepatic nodules was performed. A mild suppurative component and numerous variably granulated mast cells were observed. A presumptive cytologic diagnosis of mast cell tumor was made. Histopathology was performed, confirming the cytologic interpretation. [ABSTRACT FROM AUTHOR]