I stumbled with the first link yesterday while browsing my FB, the second is one of the sources and it is in ENG.
Am not sure how much money was spent in discovering that big dogs perform better against wolves than smaller ones but I'm pretty sure it wasn't necessary importing exotic european breeds to find a suitable dog for that problem. We don't have wolves in Bolivia but we used to have a huge population of bobcats and mountain lions, nowadays those are almost extinct due to expansion of man. I can remember a couple of clients who only needed dogs for guarding their stock against those felines and my old man would simply recommend two or three BIG dogs, raise them near the cattle and let their pack instinct do the rest. Of course, back in the day, purebreds were not as common as they are today but even so, importing a dog? I can name 3 breeds of the top of my head that are easily available and would get the job done: Rott, GSD (working line for the love of god ), any mastiff (american, bull etc..) maybe even a doberman?