GO! Solutions Sensitivities is Petcurean's limited-ingredient, grain-free line — one animal protein and a short ingredient list, which is what you want when you are working out what a dog reacts to. No grains, and nothing extra to confound an elimination trial. Salmon only. Available in 3.5 lb and 22 lb bags; Petcurean also makes a 12 lb if you want to carry it.