I'm in the same situation, recently adopted an adult GSD & have two cats. Just saw the tip on not letting her stare at them, I will nip that in the bud now. I actually thought she was just sussing them out. I have 1 cat who will stand his ground and stare back but another 1 that is skittish and will run, My GSD darted after her once so far and I intercepted. We are having difficulty with toilet training too. I'm bringing her out during the day every few hours, especially after meals but she seems to like to save it up for night and leave us a present in the morning! It's early days yet I suppose. Will be interested to hear how you get on with your dog.