I have my first client (!!) who has three large labs that she wants walked. I will have to walk them individually - at least at first - because of their size. If I am offering a half hour walk per dog, that's 1.5 hours of my time not including travel back and forth. I wanted to charge $12 per walk (per dog), but thought about going down to $30 for the whole pack. Does this seem reasonable, or should I just be charging a flat fee of $12 for the entire thing?