Our puppy also rings the bell to go outside. If we are in the room with the only door that doesn't have a bell, she will sit at the door and give us the Basenji snarky stare - then run back and forth between that door and one with a bell - she makes it really clear what her purpose is. However, she also rings the bell when she just wants to go out walking - or because a squirrel is in the drive, or birds are chirping and she wants to go see them, or someone rode by on a bike, or the wind is blowing, and leaves are out there to be caught, or she's bored - we have to judge the timing - and ignore her if it's obvious she's just wanting out for her own reasons, not business.