As far as varying meals - it totally depends on your specific pup. For my 4, I can feed them something different all the time, and they do just fine. Other yorkies, not as well.
You can also just get the "supplement mix", which is balanced, and then add your own cooked meat. One example of that is U-Stew.
__________________ ~ A friend told me I was delusional. I nearly fell off my unicorn. ~ °¨¨¨°ºOº°¨¨¨° Ann | Pfeiffer | Marcel Verdel Purcell | Wylie | Artie °¨¨¨°ºOº°¨¨¨° |