These pups will only be sold to someone who will not breed, who understands their characteristics, who only wants companionship and nothing more. They have to understand that they will have to be nuetered. I have spoken to a few people that have blue borns and they are years old already, one even 14..... how exciting is that.....anyways, I haven't had a problem with these guys and they have had vet checkups, all they find different about them is the fact that their hair is fine and course. Nothing medically wrong with them at this point in their lives. They show no signs up being different. The article that was posted is the only article I found on the entire web. I research it for a good 8 hours. I found the same sight again and again. So that is a breeder's opinion, my babies just came unexpectedly, I didn't even know my mama was in heat when she got pregnant.