I always tell dogs to stop looking at me like that. Stop it! They know a sap when they see one.
I have a friend who has a golden retriever. The dog is not allowed to be fed from the table. Whenever Mr.FF and I are both at her house, the dog knows he's a sap for puppydog eyes and she give him THE LOOK. I have to threaten him, "she'll get in trouble if you feed her. Do you want her to get in trouble?" It's like talking to a 3-year-old! But the dog knows who the soft touch is.