The dog we had when I was a teenager often had food scraps, he later had bowel cancer, that scared the hell out of me, to think he was eating the same as us, mind you it could be pure coincidence, i also think one has to be careful, as now I have only cats and discovered via the internet Garlic is toxic to them, think about how much human food has hidden spices, garlic often being one, like in sausages etc, so I now steer away from anything I am not sure of.