I was wondering the same thing.
I was hearing so many horror stories about potty training Yorkies I was honestly VERY anxious about it before we got Peach...
BUT, just like Abby, she is create trained...goes a few times in the night...gets treats everytime she goes...runs to the door when we say "go pee?"...she is 12 weeks old.
She had one accident on the drive home, 6 hour drive, and since we have been home (4 weeks now) she has pooped in the house 3 times and peed once, but they were ALL right by the back door, WE just didn't see her go to the door. I was thinking maybe because we had another dog, Peach goes out everytime our other dog goes out...but who knows...and I am NOT complaining! I say just enjoy it