[TwoforFun]

I think it just depends on all the dogs temperament. If the other dogs are puppies I would probably not recommend it unless you want to adopt an older yorkie. There are alot of yorkies that are in shelters because there 10lbs.

If your always home than I don't see nothing wrong if you can keep an eye on them. I have a 5lb yorkie who gets along with any breed no matter what size. Even as a puppy she was very calm.

Find a reputable breeder who is willing to work with you. They might want to meet your other dogs and ask questions of how you plan to make things work. I think they might have a better answer since they will know more details.