Freezing in baggies is a convenient way to go, that's what I do. Easy way to easily mix stuff up, throw some organ meat, bone, fish on occasion. You don't really even need to worry too much about it being totally thawed, they do fine with frozen meat.
My vet recommends raw feeding to. My butcher makes up raw food and freezes it in meal size bags, I think its better than the commercial stuff.
sisu - now if only those yellowstone wolf packs could find someone to roast their elk for them they'd be all set ;-) I'm happy to report that mother nature figured out how dogs could safely hunt and eat long before we came along and saved them with kibble.