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Originally Posted by Maximo  Depends on your Yorkie's lines. Some mature earlier, others later. Your pup probably has some more growing to do, and may put on more weight with muscle development.
My boys had their last growth spurt at 11 months of age and they both developed muscle in their second year. |
Mine were pretty much full grown by 8 months or so- but they filled out some until they were about a year.