I recently switched Lillie from purina. I went onto several sites to compare content, and price. I like science diet, and nutro for not too expensive natural dog food. Neither is made with the “animal meal”(the parts we humans won’t eat..). Science diet is corn based, and here in fla. a 40 pound bag of just regular adult food is 44.00. Nutro has lots of variety, and most pet stores can order any variety from them. Also, they have special blends, too, and the one I like most for pits is the “adult high energy” blend-for obvious reasons. It runs about 40.00 for reg. adult, to 45.00 or more for specialty blends. The other brand I tried is Rachael ray’s nutrish, which Lillie LOVES. It is made with real chicken as the first ingredient, and a 28 lb. bag is 26.00. Pet smart and Petco have a tool on their sites where you can pick 5 different foods to compare ingredients, price, etc. You can also go straight to the website for that particular food brand.