We have two large dogs. And they bark when they hear anyone at the front door. But one night, in the middle of the night, our electric garage door opened. Scared the hell out of my husband and me, so much so that we armed ourselves, and stated loudly that 'we were armed' on our way downstairs from our bedroom. Both our dogs were standing at the door in our greatroom, the door that leads into the garage. Neither dog barked. I was shocked, these normal, LOUD and rowdy barkers were silent. Later I realized, they never bark at people that come in from the garage door, because only family and close friends come in the house through the garage. Even though hubby & I were frantic, the dogs were waiting to see which *friendly person* was coming in that garage door entrance.
OMG. (well don't leave us hanging - who was it? why did did the garage door open?)