Which is the best dry dog food for old alabai dogs?

Hello, We have a 8 year old male alabai which lives in a production plant and has little exercise. I want find him the best dry food available, since I think he can not get the necessary nutrients from the food given to him there. I live in Turkey. The brands we have here are as follows: orijen,advance, acana, pro plan, performance, royal canin, pro pac, specific, enhance, eukanuba, cibau and brit. Could you please recommend me a brand so that I can feed our alabai healthy. Thanks in advance, Oylum Alatl?

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