Depends on who you wish to believe.
First of all, welcome!
Second, there are many opinions on dog's diet. There are the people who say kibble has all a dog needs, there are people who say RAW diet has all your dog needs (RAW diet includes: meat (muscle), offal, and bone), there are people who say BARF is all your dog needs (bones and raw food), etc.
Frankly: whatever works for your dog. Just make sure to have regular check ups, regular blood analysis, etc until you know it's working for your dog. If your dog doesn't eat vegetables, make sure you are correctly following RAW diet: Meat and bone percentage varies (watch your dog's stool, if it's too soft, too little bone, if it's too hard, too much bone) and you need to add 10% organ meat and 5% liver.
You might want to add a vitamin supplement if you're not sure.
A good place to figure out nutrition is boxerworld/dogfoodanalysis. I don't even have a boxer and I enjoy their articles very much. (I hope this is not against the site rules? It's just a recommendation)