Dogs' eyes evolve to appeal to humans

If a dog has eyes that seem to be telling you something or demanding your attention, it could be evolution's way of manipulating your feelings. Researchers have found that dogs have evolved muscles around their eyes, which allow them to make expressions that particularly appeal to humans. The findings, from UK and US researchers in anatomy and comparative psychology, show that the facial change has developed over thousands of years of dogs living alongside humans.
 Previous research has shown that dogs are more likely to use this "puppy eyes" expression when a human is looking at them - suggesting that it is a deliberate behaviour and intended for human consumption. Anatomist and report co-author, Professor Anne Burrows of Duquesne University in the US, says that in evolutionary terms the changes to dogs' facial muscles was "remarkably fast" and could be "directly linked to dogs' enhanced social interaction with humans".
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