I have 3, all from the same breeder. 9,6, and 11 mos. My 6 yo has MVD, the other 2 are healthy as they come, no problems, not even non dissolving baby teeth
I informed the breeder when my Zeus was diagnosed as a puppy, and she was great about it, and very forthcoming about his parents, and told me those two parents would be spayed/neutered and placed in pet homes. She is not a show breeder and admittedly breeds pet quality yorkies, but tries to avoid "tiny" yorkies and her puppies are reasonably priced. So I believe it is possible to have healthy yorkies. I guess there are never guarantees, but even after having a health issue with one of my dogs, I still trust the breeder. Any breeder can have an issue within a line or a pairing. It's what happens afterward that tells the story.