I think all responsible breeders are ensuring that no DM affected pups are born now. Before the test was available, sadly some were, but this doesn't necessarily rule these dogs out from breeding if they are special in other ways (character, interesting blood line etc). Like a carrier dog, they must be mated ONLY with dogs tested clear - this way, no DM affected puppies need ever be born again. If there is a puppy tested DM/DM these days, the breeder is not worth working with anyway, so you would not be in the situation of making a decision to have a DM puppy or not...
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