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Dogs can smell when a human is stressed, according to new study

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dailyrecord.co.uk

Dogs are known for their powerful noses, sniffing out drugs and explosives as a safety measure. But it's now been discovered they can actually smell when humans are stressed - even when it's someone they don't know, according to a new study carried out by Queen's University Belfast.

Researchers say this skill could be useful when training therapy and service dogs, as stress can be detected by the scent of a person's sweat and breath.In the study, scientists collected samples of sweat and breath from 36 people before and after they undertook a hard maths problem.They all reported their stress levels before and after the task, and researchers only used samples where the person’s blood pressure and heart rate had increased.When presented with samples, all four pooches – Treo, Fingal, Soot and Winnie – were able to identify the stress samples.Clara Wilson, a PhD student in the School of Psychology at Queen’s University Belfast, said: "The findings show that we, as humans, produce different smells through our sweat and breath when we are stressed and dogs can tell this apart from our smell when relaxed – even if it is someone they do not know."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."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."One of the pooches that took part in the study was Treo, a two-year-old cocker spaniel.His owner Helen Parks said: "As the owner of a dog that

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