[Mayzoo]

I will not breed, so a breeder will come along and give you more information. This is the small amount of knowledge I have gleaned from here.

You would need tons of research on breed standards, the genetics involved in obtaining breed standards in the future puppies, medical emergencies involved in pregnancies and delivery, emergencies that arise with young puppies to avoid death, the genetics fully tested of both the potential parents, recessive and dominant gene studying, and lots of other stuff. Plus, you would need a mentor.

Apparently, many yorkies either perish during labor or they have puppies with varied genetic abnormalities.