Cancer is the leading cause of death in older dogs, and pain management in canine cancer patients is essential but often inadequate, making cancer pain one of the most significant end-of-life welfare challenges in companion animals.
Dogs with cancer suffer from pain that is often undertreated because owners and sometimes veterinarians underestimate its severity or are reluctant to use strong analgesics. Bone cancer causes severe, constant pain that conventional NSAIDs alone cannot adequately control. Tumor growth into surrounding tissues, nerve involvement, and inflammatory mediators create a pain syndrome that requires multimodal approaches. Dogs in uncontrolled cancer pain experience behavioral changes - reluctance to move, aggression when touched, disrupted sleep, and reduced interest in activities they previously enjoyed. The ethical obligation to provide adequate pain control in terminal illness is the same for dogs as for humans - suffering should not be the price of a few additional weeks of life.