I started to read the ingredients for Protein from Beef, "Beef, Chicken Meal, Pork Meal, ..." Pffft. Why not call it Beef/Chicken/Pork?
On protein content: Natural Balance has a Limited Ingredient Diet with Lamb (and pea) at 32%. There must be a market because the "32%" is prominent on the package. I'm trying one dog on it (despite the protein content) because nothing else has worked for her.