Acana is a good dog food. Hell, it’s MUCH… MUCH… MUCH better than Royal Canin. In fact, I could literally name a couple dozen other brands I’d feed my dog, or recommend to others, before Royal Canin. So right off the bat there’s a problem.
With that said, even if somebody fed Acana or almost any other food but RC, their dog may need a supplement(s) of some kind. Take larger dogs that are prone to hip and joint issues… you may want to add a chondroiton/glucosamine supplement to their food. Or say you have a dog prone to UTIs… add a cranberry supplement to their food.
As for your last eye roll inducing paragraph… just like not all different breeds have the same dietary needs, neither do two dogs that ARE the same breed.
I really shouldn’t need to explain this to somebody with “doc” in their name, but alas…
