Consistency, persistence, and repetition. It's not that tough. But you also have to maintain a calm energy level. If you are a spaz, the dog will spaz. Explains why I run into all these women walking little yippy dogs that go out of control when they see my two. The woman's reaction to me and mine walking by triggers the fuse in the dog.

They are amazingly consistent. If there was a cat under that particular white minivan one day, there'll be a cat there everyday, so it must be inspected every time you walk past. If it's Thursday and we took a shortcut back home, then every Thursday we must turn that way.