[elf]

IMHO it's important that breeders realize that they can keep N/DM dogs in breeding program as such dogs may have others very positive part therefor are important for the breed (in addition at the end 50% of CSV may be carrier).
I really understand breeders want to "clean" their own kennel but if you look at how distributed control work (e.g. emergent behaviour) you will see that each one action is important. This has already been done in the past (sorry I forgot the breed name) this breed was affected by an eye disease, the breeding club + breeders follow a restrictive breeding program, at the end the disease almost disappear so this has been 'working', but what this gene narrowing bring to the breed is another new eye disease more serious than the other one. The DM test result is just another part of the breeding value of a dog, but not an absolute 'not for breeding' mark.