I'm so sorry . I can't even begin to imagine what you (and Kirk) are going through, as I've never had a dog with HD. I would call the breeder though and let her know that Kirk does have HD, as it is important for her to know what sort of puppies her dogs are producing and it is also beneficial to the owners of Kirk's littermates. I don't know how I'd go about saying it, as I've never experienced this, but I strongly feel that she has to know. Good luck with your boy!