Royal canon for our staffy.
Our staffy is a rescue dog ,we had her when she was nearly 1. I won't go into details of how badly she was treated, anyway we tried various foods for her, a few weeks later my sister in law said try royal canin, so I purchased a 15kg bag to try ,nearly 5 years later she's still on it she's as fit as a butcher's dog. Her nose is cold & wet her coat shines, and we've never had any problems with her diet yet and Poppy has energy to spare brilliant.