[pugmomsandy]

There is no “proper” way or any rules stamped in stone. Ideally, you want to include different brands so you get different variations in the vits/minerals/EFA’s. You also want to included different proteins (chicken, beef, fish, etc) and different binders (peas, sweet potato, tapioca, lentils, etc). The frequency of variety is up to you – different food at every meal or different food every bag or even changing foods only 3 times a year.