Everybody has a pig-dog deep down inside of them - or what Germans call a "Schweinehund." Just because you've never actually seen one doesn't mean they don't exist. Pig-dogs, in fact, can be very stubborn. You know you ought to go on a diet, or get up early to go jogging, or sit down and concentrate on that long-overdue paper - it's the proverbial pig-dog inside of you that you have to overcome to actually get going.