Well, I'm feeling a little stupid - be nice. I asked Delwyn a few weeks back if he had tested the whole litter for DM? He said no and worried that he should have done. I told him that all the pups were registered as clear on the KC website, but till today I've completely forgotten about it.
This morning I was looking at Jane's registrations for her litter and again saw all the pups recorded as clear. Fearing the website was having a meltdown I questioned Jane. She said yes, the puppies are "Hereditary clear" as both parents are tested clear. Oh my god of course they are, they can't be anything but clear can then. If both parents are clear then the puppies have to be clear. Why did I not work that one out?? Feeling dim!