Actually, a hungry dog is usually an angry dog. They don’t necessarily make good guards because of obedience, they make marginally ok guards who want to take a bite out of whoever comes by, be they kids, or other animals, or the person who takes care of them, or whatever.
You know what makes a dog obedient? Being well-fed and well-treated and trained with a lot of consistency. Hey, kind of like human workers! Whaddya know…
-Signed, a person who works with dogs professionally.