Bloodhounds have saved people lost in the wilderness by tracking scents over long distances.
Border Collies have guided lost children to safety using their herding instincts. Lassie the fictional collie was famous for rescues.
German Shepherds serve as police, military and seeing eye dogs. Their intelligence aids search and rescue efforts.
Saint Bernards have saved people trapped in snow avalanches for hundreds of years. Their barrel bodies held brandy casks.
Labrador Retrievers serve as guide dogs and as search and rescue dogs. Their keen nose aids detection efforts.
Golden Retrievers commonly work as bomb and narcotics sniffing dogs. Their high intelligence aids law enforcement.
Pit Bulls have served as police K9s and therapy dogs. Owners share stories of them saving owners from danger.