When your dog looks you straight in the eyes, it's not meant as a sign of aggression. In fact, it's the opposite. Eye contact between dogs and their humans is a sign of love - and sustained eye contact releases oxytocin, the "bonding hormone," in the brains of both dogs and owners. That's the same hormone, by the way, that's released when new mothers hold their babies ... so if you call your dog your furry child, you're not far off.
5. He yawns when you yawn.