I agree with Saschia absolutely.
Also, I feel that it is good to add to my previous post (if I could edit my post, I´d do it), that my dog Mery actually never bit any other dog. All the correcting training and measures that I described, we started to use straight after Mery showed aggressive and abusing behaviour towards one or two submissive dogs.
It might be a bit more difficult and more long-termed process to change behaviour of a dog, that already had a lot of practise in biting into other dogs.
But of course, it can be done.