Osteosarcoma is the most common bone cancer in large breed dogs, causing severe pain that requires aggressive palliative management to maintain welfare when curative treatment is not pursued.
Osteosarcoma welfare requires confronting the reality that curative treatment (amputation plus chemotherapy) is expensive and not accessible to all owners, while palliative management has defined limitations. The welfare imperative is to provide effective pain control for whichever treatment path is chosen, using validated pain assessment to ensure management is genuinely adequate rather than simply medicating and hoping. Dogs with poor pain control from osteosarcoma are experiencing severe ongoing welfare compromise. When palliative management no longer provides adequate quality of life, timely euthanasia is a welfare act, and owners need support to recognize this threshold before suffering becomes extreme.