How do canines communicate?

It's worth a post. I've wondered about how freely and effectively wolves, coyotes, and dogs communicate. Whole neighborhoods of canines will talk whenever they feel like it. I met a girl in the elevator the other day and she was with a dog (they had the same attitude, tall and thin and kind). Her dog approached me for scritches and I obliged. The girl said, "Wow, she likes you. She's usually quite shy." And I considered how her dog might have been a vehicle for her own expression. 

Anthony Warner