Dogs really are man's best friend, it seems, as researchers have shown they can recognise emotions in humans by combining information from different senses. They are the only creatures outside of humans who have been observed to have that ability. -SNIP- "Our study shows that dogs have the ability to integrate two different sources of sensory information into a coherent perception of emotion in both humans and dogs. "To do so requires a system of internal categorisation of emotional states. This cognitive ability has until now only been evidenced in primates and the capacity to do this across species only...