The mixture with high working line gsd with a wolf subspecies carpathain wolves which are known in wolfworld as more let us say activ wolves subspecies. Guess why in
www.wolfscience.at they took american wolves and not carpathian wolves although they would get them for free from Zoltan Horkey who have his only 150 km away from them. They had some and gave them back... They were not easy workable like the american ones are.
And please you do not want to tell me that a IPO III high working class gsd is hold as a pet in a house with kids. In germany these animals are sitting in kennels. The owner tell you that these animals will only work very good because they had to wait so long and are ready to work when letting them out.
The founder gsd and the founder csw were all aggressiv dogs because they must be or how do you think a dog would get a hold of a person who tried to escaped over the iron curtain? The task from these csw were like a herding dogs task, go and get that person. And they must work alone. And if there was no soldier they even were allowed to kill the person! You honestly do not want to tell me that these dogs were pet dogs!