Cancer is among the most common causes of death in older dogs. Understanding the welfare considerations around diagnosis, treatment, and end-of-life care helps owners make compassionate decisions.
Dog cancer welfare requires navigating the intersection of advancing veterinary medicine and the limits of what treatment can offer quality of life. Unlike human cancer patients, dogs cannot consent to or describe the experience of treatment — owners and vets must interpret behavioural and physiological signs to assess whether treatment is improving or compromising quality of life. The welfare question is not only whether a dog can survive with treatment, but whether the treatment-burdened life is one of reasonable quality. Pain management is central: dogs with cancer who are in pain have poor welfare regardless of prognosis. Palliative care focused on pain control, appetite support, and quality time with owners may be a more welfare-positive choice than aggressive treatment for some dogs. Euthanasia before severe suffering sets in is an act of welfare, not abandonment.