If they can reach it, then it's considered fair game. Recently my son was eating chicken nuggets in the living room on a tv tray. He closed up the nugget box. Maybe an hour later I went down to taker her out to potty and she was trying to dodge me. Well I snatched her up and took her outside. She was acting strange, not sniffing at stuff, so I picked her up. Well miss thing had a nugget in her mouth. When we got back inside I hid off to the side of the room, the little devil jumped up on the sofa, pawed the box open and helped herself to another. She then walked over to the arm of the chair, stood up on it, leaned over to the end table and proceeded to wash down her nugget with some coke from the cup.
You just gotta love these buggers.