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What can dogs teach us about jealousy?

What can dogs teach us about jealousy?

Jealousy is such a powerful emotion that at least one study has characterized it as the third leading cause of non-accidental homicide in all cultures. Is it possible that this universal green-eyed monster evolved as a survival mechanism?

In a study published Wednesday in the journal Plos One, researchers at UC San Diego experimented with dogs to see whether they, like humans, were hard-wired for jealousy.

If so, the researchers suggested that human and canine jealousy might exist for similar "primordial" reasons.

Although many dog owners will attest to bouts of canine jealousy --  even evolutionary scientist Charles Darwin suspected that the creatures...