Breeding size is just one consideration when breeding yorkies. Like Gail said, you cannot just go by how much the female weighs. Structure is very important. I know reputable breeders/exhibitors that do breed females in the 4 to five lb range. Any female regardless of size can have difficulty whelping. The smaller ones are just more likely to have problems. My personal preference is to breed females in the 6 to 8 lb range.
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