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It may not be news to dog owners, but now it can be said with scientific assurance: Centuries of selective breeding have created an animal that in some respects, at least, understands us even better than our closest primate cousins.

"It looks like there's been direct selection for dogs with the ability to read social cues in humans," said Brian Hare, a Harvard biological anthropologist who led the behavior study.

Scientists suspect that wolves hung around human hunter gatherers long before the first one was domesticated, perhaps in the hope of stealing scraps of food. Eventually, the theory goes, humans cajoled a few to help with hunting or guarding and began breeding those that proved to be the best companions.

Domestication, of course, is a matter of perspective. Some experts suspect that a few clever wolves initiated the process, recognizing that free food and a warm home beats living in the wild. But while scientists may never know the motivations behind domestication, they have doggedly pursued its timing and location.

Your dog has you all figured out