My family used to feed our dog a mix of brown rice, ground beef, carrots, and maybe something else when we lived in Pakistan.

It seems like it wouldn't be too hard to throw a chicken in a pressure cooker with some brown rice and cook it till the bones turned crumbly. That would be quick, easy, and aren't whole chickens only about 50 cents a pound or less.
That might be even cheaper than using store bought food.