What do you feed your LGD?

[Nanno]

The lady I bought Daisy from fed a certain type of dry dog food that they don't carry in my local grocery or hardware stores and I'm not going to drive all the way to Pueblo to buy dog food! I'm almost out of the old stuff and would appreciate any suggestions on good common brands of dog food that my grocery store might carry. I don't want to spend a pile of money on premium food, but I don't want to shortchange my good guard dog either. Is this something I even need to worry about?