[gemy]

Leggs Perthes as far as I am aware is always genetic. That is a necrotic femoral head due to insufficiency of the artery supplying blood flow. But that is not the only genetic condition vs a vs hips. You have ante and retro verted hips, you have a malformed femoral head, you have a acetabulum that is either too large or too small for the femoral head to fit into.

Luxating Patellas - such a shame with the small breeds. I agree that dual LP is highly probable as genetic problem what ever the grade. Single low grade LP is more suggestive of environmental factors.

What is important to me as an owner of a dog is to support research that guides us into best pet owner practices that help to avoid severe cases of LP or for that matter HD and ED.

What is important to me as a breeder is to support research to try to I.D. the polygenetic markers and to truly get a bloody genetic test for this. Baring that I can use Cluster Analysis, and line analysis to pick the best match for a sire/dam, that would offer the best chance of good boney structure along with all the other characteristics that typify this breed.