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  My smallest is 3.8 at 6 months, then 4.2 at 22 months, around 7 lbs at 4 years, 12 lbs at two years, and finally my boy Teddy who is two is almost 14 lbs. 
 I love them all equally and don't favor the smallest ones at all.  Size doesn't matter.
 
 Actually Teddy is my lap dog and also the most loving.  Size should never be the most important thing.
 
 I personally don't want one under 4 lbs as they are too fragile. 5 lbs is still really small.
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