[1Old Pro]

More likely he was scratching at the door and accidently hit the door bell.

Of course, and the dolt Anthony mason on cbs was amazed saying they never even trained the dog to ring the door bell, as if it was intentional, good grief.

[eastforker]

Dogs watch us and the things we do, they understand more than what you think.They watch us turn a door knob to open a door, they understand and can learn on their own how to do that also.Never underestimate what an animal can learn to do on their own.