From The Telegraph:
Dogs are the only animals that can read emotion in faces much like humans, cementing their position as man's best friend, claim scientists.
Research findings suggest that, like an understanding best friend, they can see at a glance if we are happy, sad, pleased or angry.
When humans look at a new face their eyes tend to wander left, falling on the right hand side of the person's face first.
This "left gaze bias" only occurs when we encounter faces and does not apply any other time, such as when inspecting animals or inanimate objects.
A possible reason for the tendency is that the right side of the human face is better at expressing emotional state.
Researchers at the University of Lincoln have now shown that pet dogs also exhibit "left gaze bias", but only when looking at human faces. No other animal has been known to display this behaviour before.
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