I'm Naomi and I have a deaf dane named Boo. There's two other deaf danes on here that I know of also. Speaking for Boo, the only thing special I've done for her is use a combination of ASL and "dog signs". I never let her off lead if its not fenced in too. Other than that, she's pretty much like any other hearing dog. I have to touch her to get her attention if I need her, but most people when they meet her have no idea that she's deaf. And there are times when she even seems more on "alert" than our hearing dog. She notices things our other dog doesn't.
We were lucky with her too because she's not a dog that startles easy either. We can go up to her and touch her back if she's turned away and she won't jump, or bark or growl. I don't know if that's just her disposition or the fact we used to touch her all the time when she was a puppy. The only other thing with her that's a little weird (and this could just be every dog) is that she gets a certain "sense" about people and will shy away then start barking at them. Its weird. Some people she accepts right away and others she won't have anything to do with.
But good luck with your new pup! Deaf danes are a really special breed. I wouldn't trade her for the world. And if I ever had a chance to get another deaf dane, I would in a heartbeat.
And if Mozart is a pup (or even if he isn't!), be prepared for a serious velcro dane. Boo wouldn't leave my side for anything. I couldn't even go to the bathroom or take a shower without her! She's 14 months now, so she's a little more independent, but there are still plenty of times I trip over her!