This video depicts a fully trained, cancer detection dog. Stewie is an extremely meticulous worker, checking and re-checking all the holes before she alerts at the correct (early stage ovarian cancer) sample. It is a desirable trait that the detection dog checks all of the holes (ruling out any "healthy" samples) before alerting at the cancer sample. In this run, there are 5 samples, consisting of 1 disease control other than cancer, one cancer sample, and 3 healthy controls. We train our dogs to ignore other diseases (other than cancer).