Cancer is the leading cause of death in dogs over age 10. Navigating diagnosis, treatment decisions, and quality of life assessment requires welfare-centered frameworks that balance treatment benefit against suffering.
Cancer diagnosis in a dog confronts owners with welfare decisions of genuine complexity: aggressive treatment may extend life but at a cost of treatment-related discomfort and veterinary stress; palliative care prioritizes quality over quantity of remaining life. Neither approach is inherently superior — the welfare-optimal choice depends on the cancer type, the individual dog response to treatment, the owner capacity to manage treatment demands, and the dog baseline quality of life. What makes these decisions welfare-centered rather than emotionally driven is systematic quality of life assessment throughout: tracking appetite, mobility, pain indicators, engagement with normal activities, and emotional state using validated tools like the HHHHHMM scale. Treatment that achieves measurable quality of life improvements is welfare-positive; treatment that prolongs suffering without quality life is not. The veterinary oncology community has made significant progress in developing protocols that minimize treatment burden while maximizing benefit, and honest conversation about prognosis and welfare at each treatment decision point is increasingly standard.