According to query 39, health. Com, the softening of osteosarcoma in dogs is due to the softening of the tissue at the tumor growth site or the rapid growth of the tumor, which leads to the compression of the surrounding tissue. Osteosarcoma appears soft in dogs, so it is suggested to take dogs to the pet hospital for examination in time to determine the nature and size of the tumor and formulate corresponding treatment plans. Benign tumors can be removed by surgery, while malignant tumors need to be treated according to specific conditions, such as surgical resection, radiotherapy and chemotherapy. At the same time, in the usual feeding process, the owner should also pay attention to the dog's physical condition, regular physical examination, timely detection and treatment of diseases.