I was wondering this too. I'm sure a lot has to do with genetics and overall health. Also, eating habits would affect the growth of the puppy too. Most Yorkies that I have seen are around 2 lbs. when they are somewhere in the 2-3 month range and end up being about 5 lbs. full grown. But, like I said, there are a lot of factors that can change that I am sure.
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