Sorry about your dog.
But isn't this another example of how American breeders screw things up? My vet who specializes in hunting dogs told me this. They line breed and mess with the genes. The Germans don't have these congenital problems because breeders have integrity, and maybe more brains. I live in hunting country (Ks.) and see a lot of dogs. the GSP's that are good all seem to be dark, which means that they are not mixed with English pointers. If you want an English pointer, get one, don't mix. My opinion, it is hard to get a good hunting dog anymore. Drathaars are the best choice because of their strict breeding.