I've only read that it isn't a good idea to feed the dog from the table.
If you're going to give him "people food", do it after the plates have been removed from the table as you're cleaning up the dishes.
Even then, be very careful as to what foods you feed them as they shouldn't have certain foods.
For a list of foods to avoid giving to your dog, go to:
http://www.peteducation.com/article....articleid=1030 