This study conducted by the Pine Street Foundation, a cancer education and research center in San Anselmo, Calif., found that dogs can be trained to smell and detect early-stage ovarian cancer. According to the American Cancer Society, about 20% of cases of ovarian cancer are diagnosed early. Catching the disease early results in a 90% 5-year survival rate. However, if this disease is identified late, after it has spread to other organs, only 18% of patients will survive 5 years. This emphasizes the importance of early detection! These researchers are now trying to identify how these dogs can sense cancer and what other cancers they could be trained to find.