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  In my opinion there is a big difference between a 2lb. dog and a 3-4 lb. one.  Under 3lbs. is very scary when it comes to the possibility of stepping on them etc.  I LOVED Shelby's size after 3lbs. and now she is 3.5lbs.  still love it but if she grows much more I may not be able to carry her with me everywhere.  She is a great size right now b/c she can play with other Yorkie friends that are 5lbs. +,  she can play rough with people that know her limits, she can run up the stairs like lightening, she can use her stairs and get off the bed etc. etc.  but she is still small enough for me to take her everywhere. I put plastic sheeting to protect her from falling through the slats on the stairs.
 I don't think there is really any way to know for sure the size a dog will end up.  If I was doing this again I would do as others suggested and get on a list with a breeder you trust.  Of course if they are good breeders you will have to convince them that you would be a good match for a smaller one.  Finding a 5lb. dog is not difficult, finding a female under 4lbs. is tough.
 
 good luck
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