Generally speaking, here is a good rule of thumb. If you exhibit a given body posture or nonverbal behavior to a stranger at a bar, it will get the same reaction from a dog. Long prolonged stares are threatening in both situations. Squaring off of the body, closing distance, holding the body in a manner to maximize perceived size all are dominate behaviors. The opposite are submissive.

If it is inappropriate to a human, it garners the same emotions in a dog

I'll write an article about body language and posturing when I get home :-)