Dogs might have evolved to read our emotions

Centuries of co-evolution seem to have led to dogs being able to sense our emotional states. When dogs were played the sounds of people crying or humming, they appeared more stressed by the sad sounds than by the neutral one. And they’re not just learning from being around us. Pet pigs — who were also raised alongside people but whose species played a very different role in human societies — seemed to find the humming more upsetting.

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As other researchers have previously suggested, this is the result of artificial selection by humans.