Scientists train dogs to sniff out stress in human breath

Researcher Laura Kiiroja, of Dalhousie University, with Red Golden Retriever Ivy (Laura Kiiroja/Dalhousie University)

Dogs may be able to sniff out an oncoming flashback caused by post traumatic stress disorder (PTSD), research suggests.

PTSD is a mental health condition caused by stressful, frightening or distressing events, with those afflicted often reliving these moments through nightmares and flashbacks.