I feed Cody Dick Van Pattens Natural Balance - they have 3 varieties that I rotate between. He was having loose stools before switching to these, and after I switched the problem went away. He seems to love it also, as he never leaves a morsel left behind.
I have been looking into another brand "Fromm" which is what his breeder had him on; the company is here in Wisconsin and I finally found the food in a local pet store here where I live. It sounds very good and according to my calculations rates very well.