Related to this thread Here the question regarding elbow & hip dysplasia being either primary or secondary and the choice of breeding DJD Rated dogs, I would like to know more..... not from phenotype verses genotype or medicine either for that matter, I would like know why "reputable" breeders choose to breed DJD Rated dogs radiologically or why they don't ? What are the Pro's and Con's ? What are your predominants in primary verses secondary ? Actually I have a final Composition due in 2 weeks. In light of Dani's thread title and known breeders I know from browsing forums, I would like a personal views of why or why not on this issue for my final grade ? No fight is intended here, I would like to fraction the ideas of medicine, phenotypes, genotypes and reputable knowledge of the public concerning this disease and breeding dogs. Thanks in advance.