Doggie Door Dog and Kitty Door Cat gif
Adam Rifkin stashed this in Dogs!
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I didn't realize that dog is following a smaller dog.
Longer version of doggy door gif: http://i.imgur.com/GVf1M2l.gifv
Imgur comments: http://imgur.com/GVf1M2l
Reddit comments: http://reddit.com/r/gifs/comments/2wthaa/he_can_still_fit/