What type of dog food do you use?

I'm not exactly sure what kind of dog food we have for our dogs, I know it is the cheap kind from Dollar General though because that is all we really can afford. I'm not sure I really want to know whats in it though, the dogs seem to be ok with it and don't get sick or anything. Only time they get sick is if they don't have that cheap food and we have to buy them something else, I hate changing their food on them but sometimes we can't help it. They seem to like the kibble and bits one we have for them now.