Hmm... I don't know. My girl just just rounded 5 months and she's a handful...lol. It's been a while since I have had a male dog, but I seem to recall that it isn't all that different.
It seems to me that the key is to keep working with her; don't let up and don't give up. Even through the rough times I can definitely see the fruits of my labour.
Good luck to you!
Tasha - Black and Silver GSD 3/31/14