Elevated bowls are a must. I went for years with no icidences of bloat and had two in the same year. Both were operated on (and very expensive, I might add) but only one was able to be saved. To be honest, I would speak to your vet about it, just so you are aware of how serious the situation can be.
Very cute puppy! Agree on the harness as well. With any large breed dog, respect is paramount. I would strongly encourage puppy classes. I see so many large breed dogs that are so loving and friendly but they lack manners and are almost impossible for the owners to handle. Dane's are so easy to train because all they want to do is to please you. Good luck!