Cancer is the leading cause of death in dogs over 10 years old, and the welfare of dogs with cancer depends on skilled pain management, quality-of-life assessment, and thoughtful decision-making about treatment goals.
Cancer in dogs raises profound welfare questions about the balance between extending life and maintaining quality of life. Aggressive treatment may extend survival but with welfare costs from treatment side effects. Palliative care prioritizes comfort and quality of life without pursuing cure. The welfare decision depends on the cancer type, available treatments, the individual dog temperament and baseline quality of life, and the owner capacity to provide care. Pain management is central to cancer welfare — many cancer dogs are under-medicated for pain that they cannot verbally communicate. Validated quality-of-life assessment tools like the HHHHHMM scale give owners objective frameworks for evaluating welfare and making end-of-life decisions. Good cancer welfare means the dog has pain-free days filled with activities they enjoy until quality of life declines below acceptable thresholds.