The earlier the cancer is detected, the better chance your dog has at fighting the disease. If you notice any signs of canine osteosarcoma such as limping, a swelling or mass, please take your dog to the veterinarian right away. The average life span for a dog with bone cancer will depend on the spread of the disease and the treatments chosen. Dogs that have a limb amputation or limb-sparing surgery and receive chemotherapy can generally live for about 1-2 years. In some cases, dogs can survive 5-6 years after the initial diagnosis when they are treated with surgery and chemo. Dogs that receive palliative radiation and chemotherapy care with no surgical intervention have an average life expectancy of 6 months. Dogs that do not receive palliative therapy or surgery can generally expect to live for only a few months. Osteosarcoma is a very painful cancer, so it is important to provide your dog with natural pain relief and anti-inflammatory supplements to help keep them comfortable.