Have to agree with Pom-- I cook for my dog and she's the ony one still living from the entire litter. Aside from having a carnasial tooth pulled, slab fracture from chewing a bone I think, she is never sick. I cook a huge pot of yams, mash them, cook up a huge pot of brown rice and stir in the yams , then I divide it in half and put mackerel in one batch and hamburg or chicken in the other batch. I fill small containers and freeze them. I take one out as needed, one container lasts about a week. This way I can monitor her weight and the size of her meals. The best part is that I now have enough in the freezer to last till spring of 2013. I also keep some Taste of the Wild handy and feed her some with her raw meal in the pm. I feed 2x/ day. Easier on their stomach , no overload.
If you don't feel up to cooking the yams you can buy the cans. Or like Pom mentioned, any canned veggies.