... Okay, so that isn't EXACTLY how it works. Video creator Jon Hill told The Dodo, "My co-worker just got a new puppy named Bailey and I noticed it looked like this other co-worker's dog Sadie. We grabbed a box, cut a hole in it for someone to sit in, and sent Sandie through and then let Bailey walk out."
So, no quite as magical as an actual shrinking box - but equally, if not more, adorable!
Watch the full fantastic transformation for yourself below:
(YouTube: Jon Hill)