What is sad is there have been several nice stud dogs pass at to me an early age. Eight to ten years. Some I had used and they were nice enough to tell me why, as they knew it. Sometimes you don't know. Sometimes you can look at the pedigree and guess. We can worry, will our pups have what the sire had, but it really is a waste of time. Most will not even be honest with us about TVD, Seizures, etc. No clear dogs out there. Not really.