Reader Squees: Penny Bear

starinthemargin says: "This is our new Goldendoodle pup, Penny. We love the show "The Big Bang Theory," so we named her Penny, and we've already started on teaching her a trick associated with Sheldon's knocking routine!"

Would the owner of this gorgeous pup kindly inform us less television-savvy squee lovers what precisely "Sheldon's knocking routine" is? I'm curious to know the awesome kind of tricks this darling little puppy's learning!

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