Pet dogs are much more likely to steal food when they think nobody can see them, suggesting for the first time that they can understand a human's point of view.
For years, dog lovers have argued that their beloved pooches are clever and can understand humans - but until now it hadn't been tested by science.
Experts have discovered that when a human tells a dog not to take food, it is four times more likely to disobey in a dark room than a lit room.