You cannot say dog is N/N from these. You cannot even say for sure dog is N/N if all his offspring after N/DM (or N/N) mother is N/N. You can assume a dog is N/N only if both his parents are certified N/N. The same goes for DM/DM.
You can assume with good certainty that dog is N/DM from the offspring, if you have all kinds of offspring (both N/N or DM/DM), or if you have N/DM dogs from N/N or DM/DM mothers. So to know the results of your dog it is easier to have it tested, rather than test a lot of it's offspring.
Although the genes behave statistically (meaning from N/N x N/DM crossing you should have 50% N/N and 50% N/DM offspring), you cannot say for sure that father (or mother) is N/N, if it produces only N/N puppies, as you are not sure you have tested all it's offspring (not all pups are tested, and maybe some pups died in utero). If after 10 years of producing N/N pups one of the offspring is N/DM, it can invalidate your previous assumptions. Of course this situation is very very improbable, but still not impossible. The more offspring tested you have, the more sure you are, but you can never be 100% sure.
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