Of course there are a lot of aspects to consider. But think about it maybe like if all people were to demand testing, whatever the results are, the person is at least making an informed choice and accepts the 'risk' of a carrier (either DM or others) or affected dog.
Also I know many people plan or dream about future pairings, I'm not a breeder but I think that if more people tested, there would be more dogs to use in 'safe' combinations that are also interesting. The problem now that you can see with DW for example is that only very few people have tested. And for those people who know their dog is a carrier either by past litters or by the test, often have to restrict themselves as to what partners they choose for their dogs..
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