Dogs are amazing, and we all know it.
Researchers from Queen's University, Belfast, collected sweat and breath samples of 36 participants before and after they handled a tense mental arithmetic task. Before and after they completed the task, participants reported their stress levels, and researchers used samples where the person's blood pressure and heart rate had increased.
The dogs, Treo, Fingal, Soot, and Winnie, were trained on how to search a scent lineup, then notified researchers about which sample was correct.Four dogs were introduced to the relaxed and stress samples while researchers were not aware whether there was an odor difference that dogs could differentiate.
"The research highlights that dogs do not need visual or audio cues to pick up on human stress. This is the first study of its kind, and it provides evidence that dogs can smell stress from breath and sweat alone, which could be useful when training service dogs and therapy dogs," Wilson added."It also helps to shed more light on the human-dog relationship and adds to our understanding of how dogs may interpret and interact with human psychological states.
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