Trouble is you can research the "lines" of the dogs all you want, you still won't know what the dogs actually are. I mean the amount of other breeds that were used in the "recovery" is evident in the breed today on both sides of the ocean, all you have to do is look at the state of the breed. Boxers, Bull Mastiffs, rotties... What is written on paper is just that. On another forum a member did a DNA test to see what he would find, the outcome was quite interesting...