This finding tells us that an acute, negative, psychological stress response alters the odor profile of our breath/sweat, and that dogs are able to detect this change in odor.Researchers from the United Kingdom found that dogs can smell human stress with nearly 94% accuracy.
Why It Matters: Dogs have long been considered a close companion to humans. However, a new study is the first of its kind to confirm the extent to which dogs can sense a shift in chemical signals when humans' psychological state changes, particularly in moments of increased stress. Because service dogs are typically trained to respond to visual cues and not chemical/psychological signals, these findings can be used to better train emotional support and post-traumatic stress disorder (PTSD) service dogs.
Dogs can smell when we're stressed, study suggests (Science Daily)
The full study: Dogs can discriminate between human baseline and psychological stress condition odours (PLOS ONE)
by Jenna Lee,