Welcome to Yorkie talk..I can't help you with your question, due to I have three Yorkies. But they are usually friendly with everyone, people, cats, dogs. Every time I have gotten a new baby, the others have openly accepted the newbie..
I just love all of mine, they always want to be with me and Mine are def. LAPDOGS...
As a matter of fact two are on my lap right now. So happy you decided on a Yorkie for your stay at home buddy. You will wonder why you never had one before now...