Phantom entrance

     Not a big deal, but I was working upstairs today, the dog was lying lazily nearby. My wife was at work. A sound that was distinctly like our backdoor opening and closing was clearly heard. The dog jumped up and ran down the backstairs to the kitchen. Thinking my wife had returned home early, I went down the stairs as well, asking her why they'd let her off early. No response. The dog was standing in front of the backdoor looking confused. There was no one around. Typical for this house; after a while you just accept it as a fact of life and return to whatever you were doing.