Cancer is the leading cause of death in adult dogs, and welfare-focused veterinary oncology aims to balance treatment efficacy with quality of life, recognizing that palliative care is sometimes the most humane option.
Cancer welfare in dogs requires ongoing quality-of-life assessment throughout diagnosis, treatment, and the terminal phase because the welfare implications of different treatment choices vary substantially by cancer type, individual dog, and owner circumstances. Some cancers respond dramatically to treatment with maintenance of good quality of life, while others cause rapid deterioration where aggressive treatment imposes additional suffering without meaningful extension of comfortable life. Welfare-centered veterinary oncology places quality of life rather than survival duration at the center of decision-making, using validated assessment tools to help owners recognize when their dog is suffering despite treatment. Pain management using multimodal analgesia, appetite support, and comfort measures can maintain quality of life during treatment or provide a comfortable final period when curative options are not pursued. Timely euthanasia when quality of life cannot be maintained is itself a profound act of welfare.