I believe it's diet related. Kibble has gotten to the point where there are rather excessive amounts of some nutrients in order to be able to feed dogs of all sizes. My previous kibble fed dogs did get pano. My dogs that were fed a home prepared diet that met their exact NRC needs, didn't, and from I'm told, none of the puppies that have had diets designed this way by Monica, haven't either.
Elaine and the herd