What does advancing up in sleuth themes do for you? Can you skip a theme? (For example, I can afford to buy the theme for Cosa Nostra but I haven't gotten to circle of light yet.)
The dog doesn't have anything to do with the themes as far as I know.
Yes, i think Luc posted on the wrong thread, so don't you worry Leslie. Ency basically said it. Sleuth themes are basically collectibles, and serves as the background for the game only, from what i know.