I'm really glad Gus is potty-trained now.
He sits at the front door and barks.
He sits at the front door and growls if there is someone nearby (instead of barking).
He sits at the door and rings his little bell.
Sometimes he does all 3.
And sometimes you take him out and he does nothing.
Today I think he's just bored. And one-third of my walking crew is out of commission.