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By Amy Eley

Careful. One look at at someone else's dog and your own pooch might turn into a green-eyed monster.

Researchers at University of California, San Diego have found evidence that it is possible for man's best friend to feel jealousy, particularly when their owners show affection toward other dogs.

With 36 dogs and their owners as test subjects, psychology professor Christine Harris and former student Caroline Prouvost conducted a study in which dogs watched as their owners petted an animated toy dog. The original dog would often start showing signs of jealousy and act out with attention-seeking behaviors, including pushing at their owner or the rival pup.

"Our study suggests not only that dogs do engage in what appears to be jealous behaviors, but also that they were seeking to break up the connection between the owners and a seeming rival," Harris said in a press release. 

You might want to follow up with a treat and some extra loving to keep doggy loyalty intact.