We started using German with Grim and Skadi after we started taking them to Schutzhund. Even if neither of them gets very far, I like the sound of it. Of course, we still use English for some things, like "spin" and "touch".
Skadi, AKA Lady Wolfington, GSD 4.6.12
Grim, AKA Bones , GSD 7.7.13