Cancer is a leading cause of death in older dogs, and navigating diagnosis, treatment decisions, and quality of life involves complex welfare considerations for veterinarians and owners.
Cancer in dogs presents some of the most emotionally and ethically challenging situations in veterinary practice. Owners facing a cancer diagnosis often struggle with treatment versus palliative care decisions in a context of deep emotional attachment and financial constraint. The welfare imperative is honest, compassionate guidance from veterinarians that centers the dog experience rather than treatment completion as a goal. Chemotherapy and surgery can provide meaningful quality time for many dogs with manageable side effects — but they are not appropriate for every patient. Pain management is paramount: osteosarcoma is extremely painful, and any dog with this diagnosis should receive aggressive analgesia whether pursuing curative, palliative, or hospice care. The decision for euthanasia, when quality of life is no longer maintainable, is one of the most profound welfare-centered acts owners can make.