"Our hybrids, or mixes, are always a result of very careful breeding between two of our standard breeds with vet screened and cleared, AKC pedigreed Dams and Sires. This produces happy, healthy first generation (F-1) hybrids.
Referred to as "mutts" by breeding purists and snobs, they are considered by Veterinarians to be among the best breeds for the health qualities that first generation bloodlines provide. Our customers love them for all of their great qualities as well."
I lol-ed at that line, guess I'm a snob? I've had mutts before, but I didn't buy them and they were great dogs, and I called them mutts...didn't seem to bother them at all
Oh, and there is yet to be any factual evidence that mutts are indeed healthier than purebreds. Follow this link, it explains a little better:
http://petlvr.com/blog/2009/02/are-m...lly-healthier/
I know you're looking for a yorkie, not a mutt but just want to throw that out there for anyone looking for a "designer hybrid" that happens across this page and does a google search. If they're willing to spout lies off about their mixes, who's to say what they'll tell their customers about their purebreds?
Good luck in your search, I'm sure you will find your perfect puppy match