Veterinary oncologists and medical researchers studying pet animal cancer are perhaps the single most untapped source of relevant clinical data in the fight against cancer in people. Dogs, cats and humans are the only species to get spontaneously occurring cancer in the millions of cases per year. Unlike laboratory based mouse and rat studies, these comparative oncology clinical trials are conducted by the pet’s own veterinarian, an emphasis is placed on protocols that are designed to maximize both the quantity and quality of the pet’s life, and meaningful results for both pets and people can be obtained in a one to two year period.