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It will come as no surprise to dog lovers, but man's best friend is remarkably good at detecting our moods.
A study has shown that dogs look for signs of anger, irritation or happiness in faces in exactly the same way that people do.
Scientists believe dogs have evolved their 'face reading' skills over thousands of generations as a way of avoiding an unwelcome kick.
They say that dogs deal differently with human faces from any other image, and that their method of processing the information is the same as humans use.
Past studies have shown that human faces are lop-sided when it comes to showing emotion.
Moods such as anger, pleasure and fright are expressed far more clearly on the right side of our faces than on the left.
Researchers say the right side of a face is more expressive because it is controlled by the left hemisphere of the brain, which deals with emotions.
When most people meet a stranger face on, their gaze tends to shift to the left and they watch the right side of the unfamiliar face. The phenomenon - known as 'left gaze bias' - has been shown time after time in experiments