I don't see how it matters since all Rotties are from German lines/origins. Nothing is different except the country they were born in. I've seen some pretty big BYB Rotties home grown here in America so size can be irrelevent to telling them apart, especially when a breed can be rangy in size. And of course anyone will try to boast of their dog coming from "German imported lines" (so they can sell pups for a higher price) like that's something special. Duh, they all are whether they were imported as the first generation or 10 generations back. And don't get me started on how people think that long haired Rotties are a sign of a German bred dog