A 9-year-old, 5.5-kg (12.12-lb) spayed female Poodle was evaluated due to recurrent seizures and possible diabetes. The dog also had a history of anorexia, polyuria and polydipsia. Serum biochemistry results revealed increases in pancreatic amylase and glucose associated with decreased protein levels. Abdominal ultrasound suggested acute pancreatitis and/or a pancreatic tumor with intense peripancreatic vascularization. The clinical condition of the dog worsened despite medical treatment, and death occurred shortly thereafter. At necropsy, blood clots were found in the stomach and in the intestinal lumen, which was filled with undigested blood. The pancreas was moderately increased in size with an irregular surface and multifocal yellow firm areas. In the cranial portion of the pancreas, a single nodule, approximately 2 cm in diameter, was found. Histologic evaluation of the pancreas revealed chronic and acute lesions characterized by lymphohistiocytic pancreatitis, periductal fibrosis, degeneration of pancreatic islets and necrotizing and fibrinopurulent pancreatitis. The nodule was diagnosed as pancreatic adenocarcinoma. These clinical, imaging, and histopathologic findings were compatible with Hemosuccus pancreaticus. To the authors' knowledge, this is the first report of Hemosuccus pancreaticus in a dog and it should be considered as a differential diagnosis for dogs with pancreatic disease and gastrointestinal bleeding.

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