Welcome Sam from Indiana ! I also will let others talk about the dog foods .
Mel - All of our Aussies were the same as HHD
I agree with you, Kenny and Mel about the difference between Dobes personality's and herding types. My Aussie was definitely more dog dog and less inclined to think he was some sort of a person than any of my Dobes.
And I'll touch on the food question--although it tends to be a hot button issue. I feed kibble. I don't feed raw for a variety of reason the biggest being that it's pretty inconvenient and I'm kind of iffy about whether I actually know enough about nutrition to make sure the dog is getting a proper balance of everything.
That much said--I have always (since my first Doberman in 1959) fed kibble manufactured by one of the big food companies--initionally on the advice of my first vet and later because I knew it worked.
What I do recommend is that whatever the breeder of your puppy is feeding I'd plan on feeding that (even if you think it's terrible) for at least a month--you can add thinks to it if you think it isn't decent quality (my puppies and for that matter my adult dogs get a spoonful of yogurt or cottage cheese with their breakfast and an egg--I hard boil them, other people feed those raw, and a spoonful of canned with their dinners) I add stuff to puppy food to make sure they eat well and so that they don't get picky;
After a month if you are going to change foods do it slowly--plan on taking at lease a couple of weeks to make the kibble change and sometimes it needs to be done over an even longer period of time.
I don't feed puppy kibble to puppies I feed adult food--for a big dog it seems to work out better and I have had, over the years, fewer problems with the kind of thing you can end up with Dobe puppies. And I have used Purina Pro Plan kibble as my go to kibble for years. Presently I feed ProPlan Focus Sensitive Skin and Stomach (formerly known as Salmon and Rice--it's been through a couple of name changes but is still the basically the same kibble it's always been.
But not all dogs do well on the same thing--if they need something different that's what get--one of my Dobes lived on a prescription food food for 8 of his 10 years because it's what he needed and I have a cat who has a true food allergy--he's 17 years old and has lived well on one of two hydrolized kibbles (prescription) for 15 years.
But basically I feed something that my dogs like, eat eagerly, and leaves them with energy to burn, bright eyed and with a coat that gleams and small compact poop and maintains proper weight without having to feed huge amount.
That's my standard food lecture for the day...
Just remember when you get your puppy you have to post lots of pictures and he grows.
And welcome to the forums.