@carolaltfnc. thank you for joining me. until next time, i hope you're learning to be more of a healthy you. healthy you. >>> and welcome, everybody, to "sunday housecall." i'm jamie colby. >> i'm eric shawn. joining us, dr. marc siegel. associate professor of medicine at nyu's langone medical center. also author of inner pulse, unlocking the secret to sickness and health. >> you get two opinions today. dr. david samadi, great to see you. chief of robotics. >> hello, good afternoon, and hello. we start with something that's really important. you go to the doctor, you want antibiotics because you feel lousy and usually you get them. there's a brand new report that says doctors are still overprescribing antibiotics. the study finds 6 of 10 patients

>> do you think this could have advancements on prostate cancers and other cancers? >> a very good question. the first time i read it, the first thing is maybe this is someocus-pocus science. how did it go to dogs smelling this and how do we find cancer? but then, when you really dig in, you find they're using the olfactory sensory and odor. and we human beings, we have about 5 million sensors in our nose. dogs, on the other hand, have 200 million. and the brain and olfactory are connected. the science behind this starts from 2004. james walker from florida university started doing this in melanoma, and one out of two cases, they were able to detect it. in 2006, they tried this with lung cancer. he's right. 90% of the time, they were able to find it and the dogs came through. >> that dog is named ohlund. >> he knows me by my first name. >> how do they train the dogs?