I was owned by an incredible male Dobie many years ago. He was the smartest animal I've ever seen. I taught him to go to the door and bark when he needed to go outside, by showing him. I "barked" two times, opened the door and went outside, twice. Ten minutes later, he stood at the door and barked twice. From then on, he never had another accident in the house. He would go to the door and bark.
I don't have any good pictures of him, but here's one of the few I have.

Prince: