Thank you MrsPeanut and House for the replies!
Very good advice, and I see now that it can be done successfully and a happy Yorkie is still the result!
I feel so encouraged ...
House - it sounds like you have a set-up very much like I will have. How old is your little Yorkie? Right now Rocky uses the potty pads - but if it is not changed often enough he rebels and uses the floor!
When did you stop leaving food out in the day? Right now Rocky is 2.8 pounds (he is 10 weeks tomorrow).
We have a puppy Kong and he does not seem to like it as much as squeak toys or small Nylabones. I hope that will improve though as I think it could be fun for him.