Cancer is the leading cause of death in dogs over 10 years. Understanding treatment options, quality-of-life assessment, and compassionate end-of-life decisions is central to welfare for the millions of dogs affected annually.
Canine cancer welfare requires distinguishing between two separate challenges: managing the disease and its treatment, and knowing when to stop. Dogs undergoing cancer treatment — particularly chemotherapy — can experience nausea, fatigue, and reduced appetite that must be managed aggressively to maintain acceptable welfare during treatment. When treatment fails or is not pursued, palliative welfare care becomes the priority: pain management, nutritional support, and maintaining daily quality experiences. The welfare decision around euthanasia is among the hardest owners face — done at the right time, it is a compassionate act that prevents suffering; done too late, it prolongs it. Honest conversations with veterinary oncologists about realistic quality-of-life expectations are essential.