vWD is recessive which means if the sire is clear, the dam does not need to be tested. You need two copies of the gene for the disorder to present. You cannot get a copy from a clear, therefore these pups are not at risk for vWD.The worst they could be is carriers, and being a carrier is not a health risk.he vWD test would be unnecessary, as your clear sire ensures your pup will be at most a carrier. It is only advised if you plan on breeding (and if your breeder knew she was already planning a breeding to a clear, she can in good conscience skip that test, but would need to test if she was breeding to a carrier).