Published: Nov 21, 2012 3:14 PM EST

WEST HILLS, Calif.- Rescue dogs that were saved are now being trained to save other people's lives by sniffing out ovarian cancer, according to CBS News.

Dina Zaphiris, a pet owner and dog trainer from West Hills, Calif., is working with researchers at the Pine Street Foundation to teach dogs how to detect ovarian cancer from a person's breath. 

Now, Zaphiris works four hours a day, four days a week training mixed-breed dogs how to use their noses to find cancer. First, healthy people and ovarian cancer patients are instructed to breath into sample jars that contain a piece of cloth. The samples are slotted into a specially made trough. Then, the dogs are allowed to sniff the samples. When they correctly detect cancer, they are given a reward. 

Click here to read the article in its entirety and to watch the dogs in action.