Hello Carlea, is a posibility that he is a silky or a silky mix, some"BREEDERS" have cross the yorkie back to a silky girl to get a bigger more robust litter, then they underfeed and sell WAY too young to charge big money for the pups, he is probably a bit behind if he was under nourished, now with you he will catch up and develop to his full potential..
hugs
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