As long as I keep my bedroom door shut, Riley won't have any accidents. He's been this way since I got him at 3-months-old. He will bark and scratch at the door if he has to go outside. If I let him sleep out in the living room or leave the bedroom door open for him to roam, he'll have an accident (or at least he did before-I haven't tried again in a while). He was a handful to potty train, though. He had a recent accident (a couple of weeks ago) while a friend was watching him (at my house, at least!).
Congrats on Allie's first accident-free night!