I was just reading the thread about Carsten dashing out of the car and in the replies a lot of people have said that their dogs ran off once when the door was open or when the leash dropped, etc.
My dog has absolutely no urge to run off even if I open the door wide open and tell her to run away. Of course I've taught her never to dash out of the door but even if I leave her in the yard and leave the gate opened up she won't run out. I know a few BCs and retrievers like that as well.
So my question is, what makes a dog dash out of the door or want to run out of an open gate? Is it breed? Training? What's outside of it?