No one can predict this. The life span of dogs, treatment methods and tumor growth will all affect the life span of dogs. You can try Liu Zhong. My hairy child was also an osteosarcoma at first. Liu Zhong, a Chinese patent medicine recommended by an old Chinese doctor, is quick-acting and has no side effects. I've been taking it for over a year. The doctor also said that the tumor had not spread to other parts. I saw it on the Internet the other day, so I bought several more boxes.