(2) Regarding follow-up evaluations for dogs with DI at or above 0.3. QUESTION: For breeding prospects with DI at 0.3 or above but in the tighter half of the breed (done at, say, 12 months of age), does PennHIP recommend follow-up evaluations to check for development of DJD at some later age (if so what age) prior to breeding?

Again, the above answer is useful in addressing this question. We recommend regular follow-up evaluations (for example, every 2 years) to provide the data necessary to construct probability curves for DJD in relation to DI for each breed (see illustration above). The information gained would allow breeders to predict with greater certainty, the probability of radiographic DJD in their breed given a specific DI measurement, and thus give additional knowledge to those when making breeding decisions.