HI! I've been feeding raw to my 2 dogs (one yorkie one collie) since April.
I don't for one minute regret my switch but don't feel that I'm an expert yet either. I have read you should stick to one source for a week or two and make sure they are tolerating it well before changing to another meat. I too fed chicken breast for the first 10 days and by the way, had no problems at all with that. When I first tried pork, my senior collie had a little runny poo one time but that was it. I do let my yorkie eat chicken bones and even let her chew a little on some other smaller bones. The collie eats most bones with no problem. (I don't feed the larger marrow bones though!) My dogs have changed so much since the switch. Neither one was too happy with their kibble but now they get excited at dinner time and really enjoy their meals. Anyways, here is a link to a site I really like:
Jane Anderson's Raw Learning Site
Good luck and keep us posted!