It's actually been going very well - thanks.
The door to the room that he's staying in is now kept open as long as we're home and it gives him the chance to come out and explore if he wants to. We don't want to force or rush anything, but I think we've made good progress considering it's only been a week
He's still fearful of the dog, but I can't fault him for that. He does get lots of visits if he chooses not to venture out and visit. We're getting him transitioned fairly well to better food too - he's just so fussy but we are finding a few that he seems to enjoy.