Eh. I don't like the idea of breeding just because they do sports and are health tested. If that were the case, I have a Border Collie/lab mix, she's a service dog, she's the smartest, most devoted and loving dog I've ever had, I could compete in agility with her, health test her, and breed her if she passed them (fully hypothetical of course, she's spayed). To me, that is not ethical. What purpose am I fullfilling by doing that? A good sport dog? There are plenty of successful sport dogs that can come from a reputable breeder or even a shelter.