When curative cancer treatment is not possible or not pursued, palliative care focused on comfort and quality of life becomes the most important welfare intervention for dogs with cancer.
Cancer causes multiple welfare harms simultaneously: pain, nausea, fatigue, reduced mobility, and often psychological distress from reduced ability to engage in normal activities. Palliative care acknowledges that the goal has shifted from cure to comfort, and that maintaining quality of life for whatever time remains is the highest welfare priority. This requires honest conversations about prognosis, willingness to prioritize the dog's experience over the owner's grief, and readiness to consider timely euthanasia before severe suffering begins.