Yes, dogs really can smell fear (and happiness).

Many people think that animals can smell fear, but it’s hard to differentiate between what an animal smells and what it sees and hears (for example, a screaming human running at full-speed away from it). Fear not! These scientists set out to test whether dogs can actually smell human emotions. To do so, they collected armpit sweat from people who were scared and happy, then exposed dogs to different people while letting the pups smell the sweat. They found that the dogs “displayed more stres

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