I was always concerned about our dogs being possesive of their food and/or toys around family and esp. our little son and his friends; so we worked on eliminating that behavior from the first day we got them - usually puppies who didn't know any better as babies. I figured if they never learned they had to protect their "stuff" they wouldn't.

Guess we had heard that old saying "Don't go near the dog, he is eating" from family who had dogs much too often.