Hi, C.J.
Wow. I am really impressed with you. I am not a breeder, but have gotten my Yorkies through very reputable breeders, and none have ever excluded any genetic defects from their health warranty, not LP, not collapsing trachea, nothing.
My tiny Kia's breeder, has been breeding for over 30 years, with 53 champions to her credit. She knows her blood-lines and backs them up.
I hope to read more from you.
Sheila