I'm trying out (well not personally, at least not yet) these patties made by Horizon Foods based in Rosthern Saskatchewan. (Rosthern: Home of the Regehrs -- gotta be wholesome, right?). They come frozen in a big box.
They're supposed to be nutritionally complete. No buzzing organ meats in the blender or messing around in the kitchen stuff. Thaw 'em out and serve.
http://www.horizonpetfood.com/products-pure.asp