I don't know if anything I write will help but I do think you should do what you think is best for your baby. I know it is hard but try to put him first. Quality of life is important. It wil help you very much in the long run if you know that whatever you decided to do was in his best interest. I just think it is horrible that these stores and breeders ( my Abby came from a breeder and also has a hereditary disease) are selling sick pups. How do they get away with it?????
Please remember to think of what is best for your pup and your decision should be a little easier to make.