Indian Journal of Veterinary Pathology

A three year old male Labrador dog was presented with history of anorexia, dyspepsia, respiratory distress and weakness. On physical examination, the dog showed small round lumps on the skin. Ultrasonography examination of heart, lung, liver and kidney depicted multifocal abnormal tissue. Multifocal neoplastic growths in different organs were tentatively diagnosed and the dog was symptomatically treated until death. On postmortem examination, multiple dark black masses varying from 0.5 to 3 cm in diameter were detected in heart, lung, liver, kidney, bladder and intestine. Histopathologically, these masses were diagnosed as malignant melanoma and variable melanin pigments within the neoplastic cells were confirmed by Fontana-silver method of staining technique. These tumors were considered to have originated from the primary site of skin or intestine.