In Disaster, search dogs locate the scent of victims trapped in collapsed structures. They indicate they have found someone by getting as close to the person as possible and barking.
Certification for these teams is done through federal testing. Skills for this type of training will be obtained when you are accepted by a FEMA task force as a dog handler.
FEMA: National Urban Search and Rescue Response System.pdf
FEMA: Canine's Role in Urban Search and Rescue