I wish I could give you good news but I have had Yorkies for 18 years and I have never had one that I could say was 100% potty trained and would never go in the house!! I'm sure someone will come on and say theirs is completely trained but in my experiences they are very smart and try and get their way. One of my yorkies learned to do a fake squat outside so I think that she is going potty and then she comes in and hides and pees!! I finally figured it out when I checked her privates one day and they were completely dry even though she squatted!! I hope you prove me wrong and have a little guy that is an angel, if you do , consider yourself lucky! I've just lived with wee wee pads, diapers and belly bands!!