I think some are missing the term to "improve the breed"
there are many substandard yorkies inside and out being bred then sold as "healthly, happy, perfect little puppies" passing on genetic heart aches to the unspecting public (or uneducated buyers) for the same price if not higher of a well balanced, genetic test, bred within the AKC Yorkshire Terrier toy breed standard.
Prime website selling substandard ill bred dogs is wizard of claws, for what, $5000 and up where many yorkies that dont even look like a Yorkie.
How many of you were taken by surprise when your baby doubled the weight you were expecting? ie being told he/she will be 5lbs and you watch it grow and grow and grow to 8-10lbs you many not love it any less but was it what you were expecting?
how many owners got a coat other than a silk coat? The puppy looked cute and fluffy when you bought him and now a matted hard to maintain mess!
how many of your babies have suffered with liver shunt? the breeder response is "thats impossible" offer to take it back knowing the breeder is going to put your baby down if returned. Playing on your emotions knowing you wouldnt return him/her and for you to foot the doctor bills on your own!
How many of your babies suffer from leg perthes?? the breeder response again "that impossible" same offer!
This breeder is not breeding "to improve the breed" but to meet the demand and to pay for their annual vacation!
JMHO
Knowing I couldnt breed the perfect human, I didnt