Mine get whatever make of dry dog food is cheapest from the local pet shop - except the gluten intolerant 16 year old collie retriever who gets an older dog mix in small quantities. We've had her stable for 15 years provided she gets no treats (which aren't gluten free, on the whole).We feed them all twice a day.

They seem to thrive on it. We had a GSD x wolfhound for a short while who picked and ate blackberries in season, but she didn't live well in a pack so she had to be rehomed.
I cared for my mother's Lhasa Apso for a while some years back, and it would do anything for cauliflower - including escaping into the garden and digging up the plants.

They get very very few treats, and even less human leftovers. And they thrive on it, and don't craze us.

Paws, & current pack of wolfhound x bearded collie, collie x retriever, and two beardies.