THURSDAY, Feb. 12, 2015 (HealthDay News) -- Smiling? Frowning? New research indicates that dogs can tell the difference, though it's still unclear whether they understand the emotions behind people's facial expressions.
Austrian researchers found that dogs were able to distinguish between happy and angry expressions in humans -- a feat the study authors contend was possible because the canines applied their knowledge of emotional expressions in humans to a set of unfamiliar pictures presented to them.
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