I can't tell you how many times Sophie has slipped past me and "hidden" in a closet when the door was only open for 2 or 3 seconds. I wouldn't notice she was nowhere to be found for a little while and would franticly start searching. She doesn't bark when I call her name so she must think it's a game of hide & seek.
Now if she's "missing" I just naturally check every closet door I've opened and there she is wagging her little tail.