10 Dogs Who Take Jealousy To The Next Level

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And they're resorting to all kinds of tactics: photobomb photos, peeing on their dates, and more!

It's National Dog Day! Dogs are man's best friend ... until that man gets a new girlfriend. If you've ever had a canine companion, you already know how seemingly nosy they can be of newborn babies, dates, family members, or really anyone who comes into intimate contact with you. They're kind of attention hogs. Dare we say they even get ... jealous?

Well, new research from the University of California, San Diego, proved that, yes, even dogs can get a little green with envy. In an experiment to test this theory, psychologists videotaped how 36 dogs would react to their owners when they showed affection to animatronic stuffed dogs. The result? The REAL live dogs exhibited jealous behavior by whining, barking and even biting to try and get in on all that lovin'. So while psychologists have just proven what we've already suspected for years, the real evidence has been under our noses all along. Just take a look at these ten dogs were not shy about hiding their emotions in their masters' love-dovey engagement photoshoot sessions, wedding days, and disastrous dates.

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