QUESTION (d) Can a dog be classified as having CHD based on evidence of DJD even if the DI is less than 0.3?

Yes, however, this is extremely unusual (<2.5% depending on breed) . From the above graph, it is shown that the probability of the German Shepherd breed to develop DJD with a DI of 0.3 is 0.1, or 10%, and that the German Shepherd breed is more susceptible to developing DJD than other breeds with the same given DI So for other breeds the number of dogs with tight hips and DJD would be expected to be even lower.