The worst thing i have read in this thread is a kid with food close to a dog. I always give the prime example of a kid with a sandwich, the dog wanting it and the kid reacting towards the dog, dog reacts to kid, close book.
Dont like begging for food dogs anyway, so their always kept in distance of people with food. Might have a dog at the kitchen step to get the cut offs, but dinner time is piss off !