Cancer is the leading cause of death in dogs over 10 years, and quality of life considerations should guide treatment decisions alongside veterinary efficacy data.
Cancer treatment decisions for dogs require balancing therapeutic efficacy against quality of life. Unlike human oncology, where aggressive treatment is often pursued regardless of side effects, veterinary oncology traditionally prioritizes quality of life. Most chemotherapy protocols for dogs cause minimal side effects while achieving meaningful remissions and extensions of comfortable life. The welfare challenge lies in recognizing when treatment is prolonging good life versus prolonging suffering, and in making thoughtful end-of-life decisions before quality of life deteriorates severely. The bond between humans and their dogs makes these decisions emotionally difficult but ethically important.