Totally agree with magicgenie making sure your comfy with the breeder is the most important thing! The reason I say I wouldn't want a breeder that breeds a dam at every heat is because I think they deserve a break
. Can you imagine giving birth twice a year to not just one baby but a litter? Hehehehe but either way you will find oponents/proponents to everything. It just depends on what you prefer since you'll be taking care of the pup for 15 + years, but I think you covered everything with the genetic testing I would just ask to speak with the vet about the breeding pair or ask to see the records where the testing was done