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Our canine companions have proven once again how finely tuned they are to our feelings – this time in scientific sniffing test.
Scientists discovered that dogs can smell stress in our breath and sweat.
Four dogs – pets volunteered by their owners – were trained to “choose” one of three scent canisters.
And in more than 650 out of 700 trials, they successfully identified a sample of sweat or breath that had been taken from a stressed person.

https://www.bbc.com/news/science-environment-63066715
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