what kind of dog food best for Akitas

I have a 1 1/2 y/o Akita and had him on Diamond and took off of that due to the issues they were having and now I have him on Merrick for large breeds but they have been bought out by Purina and I have already heard things and ingredients are changing so I have to change one more time. Need food with no grain, no soy, no art. flavors or wheat. Also need it to be for Large breed. Anyone have any suggestions?

Thank You,
Rachel