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Osteosarcoma in a young Great Dane dog.

A 10-month-old Great Dane dog was presented showing lameness in the left foreleg. Radiographic examination revealed a severe bony reaction of the left distal radius and ulna. The reaction together with associated soft tissue swelling increased dramatically over a 6 week period. A diagnosis of osteogenic sarcoma was confirmed histologically and the dog was euthanased. Metastases were found post mortem in the left prescapular lymph node and left lung.