I'm sure we all agree that the top priority to look for in a breeder is healthy lines. At 2 yrs. Sugar was 3 pound and naturally I thought that was his adult weight. I was surprised to find out that now at 3 yrs he is 4 pounds. He isn't overweight, he just filled out. I guess he was a late bloomer.
Other than some recent food sensitivity he is my healthiest dog. Gracie is 8 or 9 pounds and has LP and reverse sneezing. Bigger does not always mean healthier. There are irresponsible breeders who specialize in "tea cups" and ONLY care about tuning out tinies which is horrible. There are also breeders who breed yorkies that are much larger than standard- they are also in it only for the money and can turn out unhealthy as well.
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226