In this report, a case of cholangiocellular carcinoma in a 4 - year - old, male, mongrel retriever is described. In the necropsy, numerous neoplastic masses, grey - white colored, firm, 0,5 - 4 cm in diameter were seen both on the serosal and cut surfaces of the liver. Additionally, metastases were observed in the portal lymph nodes, omentum, diaphragm and spleen. Microscopically, tumor cells were generally arranged in to form ductular or glandular structures lined by mucin secreting cuboidal or columnar epithelium.