Ruff day? Dogs can detect if people are stressed, research finds

Study finds stress response changes people's odour profile' - which dogs can sniff out

Whether it's a tricky maths problem or an unexpected bill, daily life is full of stressful experiences. Now researchers have found that humans produce a different odour when under pressure - and dogs can sniff it out.

While previous studies have suggested canines might pick up on human emotions, possibly through smell, questions remained over whether they could detect stress and if this could be done through scent.