ID: 3343128 MANDATORY ON SCREEN CREDIT - @booandzero This hilarious footage shows dogs smushing their faces against glass objects - with adorable results. Doting owner Stephanie Zubor claims her two Miniature American Shepherds are so intelligent she trained them to smush their faces against glass in just 15 minutes. And a video of them performing the trick on a pan lid ended up going viral with thousands watching the pair, Zero and Boo, in action. Now, the clever pooches have mastered the art of the t
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