Dr. Curtis Mack is a board certified radiation oncologist at Arizona Oncology, an affiliate of The US Oncology Network. Dr. Mack, who lives and works in Tucson, Arizona is active on the board of Handi-Dogs, a local non-profit organization dedicated to training service and therapy dogs for seniors and those with disabilities. He understands "both sides of the stethoscope" because he is a cancer doctor and a cancer survivor himself.  A super story on how dogs can help you heal.