Islet-cell tumors of the pancreas, such as gastrinoma, are rare in veterinary medicine. Patients with gastrinoma or Zollinger-Ellison syndrome have elevated serum gastrin levels which ultimately cause gastrointestinal ulcerations. Due to their small size, gastrinomas are a challenge to localize prior to surgery. In veterinary medicine, exploratory surgery with biopsy for histopathology confirms the diagnosis of gastrinoma. This is a retrospective study of four dogs with gastrinoma.

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