[haleycookie]

I would do the wellness. Highest meat content for a large breed food I’ve found. Has correct calcium ratio as well. Dogs are carnivores. Add as much less processed things into the diet as u can (less than 15% unless it’s formulated for large breeds) Bone brother, canned food, freeze dried toppers. Etc.
if you’re interested in a vet nutritionalists being on staff, natures variety and candiae both employ one and make quality products.
I would also keep from over feeding, should be able to feel ribs under the skin, nice abdominal tuck. And don’t spay or neuter until two years so the growth plates and bones can mature correctly.
I’m also assuming the breeder is a quality one and has had genetic testing etc. otherwise poor genes may cause problems regardless of what u do.