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  Michiko - I think it would be wonderful if you get the older one.  Seems like everyone wants a puppy and sometimes the older ones get left behind.  
 Four years old is still young for a little Yorkie.  It's probably a wonderful little dog, and you could get your second dog, a little puppy, any time you are ready.
 
 Good luck - with whatever you choose to do.
 
 Carol Jean
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