NEVER FEED A GREAT DANE PUPPY ANY KIND OF PUPPY FOOD
My Danes do free feed, which you will read is “forbidden” however, all my Danes have always been free fed and never had issues. I asked a vet about it and he said that all my Danes look very healthy and so free feeding them is not an issue. But of course, please do what your Vet advises you to do. If your vet recommends elevated bowls, I have found the cheapest way to do that is by purchasing plant stands. I used to use just Dollar Store plastic bowls but they are so light that the dogs knock everything down. I know there is controversy on feeding on an elevated platform so please do as your vet recommends.
So go to some resale store and get really heavy cooking pots.
In addition to following best practices in feeding, there is also a stomach tacking procedure that can be done. Please talk to your Vet about it.
One other note on feeding. Danes have sensitive stomachs. As puppies I have them at a 20-22% protein to control growth. If you give them anymore than 25%, they will get what is called Wobbler Syndrome.