That does make some sense. Is it odd that he seems to have had it since he was a little puppy? Would something like that tend to be congenital or environmental? Our first vet mentioned something about the breeder, but we weren't sure what she meant. It doesn't really matter now, but just curious. Is it common to Goldens? This is our second Golden and would be the first we've heard of it. Thanks again and I'll stop peppering you with questions.