eating food from other people

[Carol]

One problem i've had is peopling feeding my dog when we're out in puplic or at a family thing. People think it's ok to just give someones dog food. I don't mind the ociasional treat and and there, but when someone feeds my dog half they're uneating cheese burger i start to get mad.

Any idea how i can teach him to NOT take food from other people?

Carol