A 10-year-old, male Boston terrier was presented with chronic haematemesis and melena. On computed tomography, a mass arising from the gall bladder was observed to be homogeneous and strongly enhanced compared with surrounding liver in the arterial phase. The attenuation of lesion around the mass in the gall bladder showed 60 Hounsfield units and no contrast enhancement. Endoscopic examination revealed haemorrhage around the duodenal papilla. Surgery revealed that the gall bladder was filled with a blood clot originating from the mass. Histopathology of the mass in the gall bladder revealed it to be a carcinoid tumour. The dog survived and remained disease-free for 45 months without adjuvant chemotherapy.

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