I "cook" for one of our cats regularly. Well, the cooking of a college student: open can of tuna, put tuna on plate, give plate to cat who inhales it.

Matt, you said you add grain to the food. I was under the impression that grains weren't that great. Is that not true for dogs? For cats, there's all sorts of grain-free foods (that cost way more!), and we get the cheapest one of those. I don't know anything about dog food, though...

Other than tuna (which only one cat eats), our cats don't eat anything but their dry food. One of them even tries to cover up wet food and tuna, thinking it's...something else Fortunately I've been told that if they drink enough water (they do), this isn't much of an issue.