[RustysMom]

About the marking: He can be trained to stop that. Until he gets used to being there and your Yorkie also being there, they will do it. When they get comfortable with one another it would stop if you train them that it is NOT ALLOWED in YOUR house. It is your house, not theirs..........get some good smell eraser and use it where they have marked. Also develop a sound, a noise a certain word that means NO to that behavior and say it loudly each time you catch them marking. They will learn that it is not allowed.

You may want to buy one of those blacklight contraptions that help you find urine in the home so you can treat those areas with the smell eraser. Be sure that they will probably do it behind your back for awhile, because they are Yorkies and they are smart. It will be a battle of wills between you and them, but they can be taught to not do it inside your house.