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Seventeen dogs with mammary osteosarcomas were examined at Veterinary Teaching Hospital, Kasetsart University. Data collected in this study include patient characteristics, chemotherapy administration and life status. The results showed prognostic factors that significantly affected survival rates were size of tumor and postoperative chemotherapy administration (P<0.05). Dogs with tumor diameter greater than 3.5 cm. the risk of death increased by 3.86 times compared to dogs with a tumor diameter of less than 3.5 cm. Survival time of dogs receiving adjuvant chemotherapy compared with dogs did not have chemotherapy after surgery increased by 77%. The results suggested that the use of postoperative chemotherapy and surgical removal of the tumor at a small size can significantly increases the survival time.
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