I feed mine Royal Canin. I tried Blue but they wouldn't eat it. I had mixed both in the bowl and they literally ate around the Blue.... it's a shame because I like the healthy healthy ingredients. My biggest thing is to read the ingredients on the side of the bag. If corn is the second or third ingredient listed, I keep looking, as corn is just a filler and has no nutritional value for them at all. I do keep looking though for something I think may be better for them
Good luck with your search... xo