Multiple skeletal metastases of osteogenic sarcoma in a dog.

A 9-year-old male German Shepherd Dog with osteogenic sarcoma involving the right humerus was treated by scapulohumeral disarticulation and adjuvant chemotherapy. Doxorubicin was used, at a dosage of 30 mg/m2 of body surface. Chemotherapy was unsuccessful, and 4 months after surgery, the dog developed multiple metastases of osteogenic sarcoma in the appendicular skeleton, a metastatic pattern rarely observed with primary bone tumors.