Dogs don’t just lick their mouths when they want to be fed, they also use them in a surprising way—when they see an angry human.
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Researchers showed images of angry humans to dogs, and they reacted with a lick of their mouth. The dogs did not respond in the same way when only given audio queues. This behavior may come from the domestication process—and suggests that dogs have some understanding of human emotions.
This is What Your Dog Does When You’re Angry | National Geographic