Do Horses Know What You Are Feeling?
It appears that horses can distinguish between positive and negative human facial expressions. Psychologists analyzed the reactions of 28 horses when they looked at images of happy or angry male faces and noticed that the horses tended to use their left eye more when looking at photos of angry faces, which is an equine behavior typically associated with negative stimuli. Study co-author Dr. Karen McComb theorizes that “horses may have adapted an ancestral ability for reading emotional cues in other horses to respond appropriately to human facial expressions during their co-evolution. Alternatively, individual horses may have learned to interpret human expressions during their own lifetime.”
Biology Letters, February 2016