
Guest, there's no such breed as a Miniature Yorkie. There's only one standard which accepts any size up to 7lb in weight. The very tiny examples very often have health problems and may not be long-lived. Your best bet is to contact the breed clubs listed at the bottom of the
Yorkshire Terrier Breed Standard and ask for details of reputable breeders. You may find one who has a smaller-than-normal puppy in an otherwise standard litter. Good luck.