Yes I have a high energy working gsd, however Lunas wrestling is very intense I am talking growling, snarling and mounting. I know when Angel did that to Athena (my late gsd) I thought Angel was showing dominate behavior and she turned out to be timid and scared also I had no fear about Athena being submissive. However with Luna doing it I am far more cautious just because of there temperament differences. I am looking to deep into it or should I wait and see how time will tell? I do not buy a 8 week old can he dominate over a one year old. However it has been some time sense I have had a gsd puppy. Athena never had a bigger sister to wrestle with so I can judge her.