Since this problem may be an inherited trait, it is best not to breed pets with this condition but very few breeders take this advice. (2ndchance.info)
However, sadly the program was short - lived, as there were too few breeders willing to open their doors to be voluntarily inspected! (starstrucklabradors.com)
She feels few breeders have the time and space to raise litters and grow out dogs required for a serious breeding program. (americanshihtzuclub.org)