These two dogs are also a result of someone's breeding a year ago. Any living creature carries some health risk. When humans decide to have a baby, they are not given health guarantees for their future child either.
There is of course another option. The owners can acquire a green dog from a breeder, ask and pay for all the health tests they consider necessary. This will run several thousand, but it is the only way to be sure. Some possible conditions can be ruled out in this way, which does not guarantee that the dog is not going to injure itself a week after purchase or develop bone cancer at the age of 3.