Hi and WELCOME TO YT!!!
I have introduced my Yorkies from the time they were pups to a Chihuahua and a Boxer with no problems at all. Only you know your babies' personalities and have better insight into how they would handle a new, little one but we have never had any problems. Our Chi is a Diva who lives for her daddy's attention but she's never been a problem and our Boxer has always loved the Yorkies.
As for advice on ANY questions you may have, just do a search here on the forum and you should find an answer for any questions you may have. If you don't find your answers, just ask. There are so many knowledgable, Yorkie lovers on here willing to help. Good luck!!
