To find the best dog food has been a challenge for me. And keep in mind that each dog like different things. I fed Rosie Instinct for a while but her IBS prevented us from continuing it. I have tried many different ones with Mikki. The only one I have had luck with is Taste of the Wild (but only the one with Bison and Venison). I have always heard good things about Blue Buffalo too. You can also get information from sites such as this one.
Dog Food Analysis - Reviews of kibble Good luck with your search!