When entering a store in a small town,a stranger who saw asign warning,"Danger! Be careful with the dog!" affixed to the glass door. Inside, he saw adog "dangerous" old asleep on the floor atthe checkout counter."Is that dog?" asked the owner. "Yes, that's it," came the reply. The stranger was a little amused."It certainly does not look like a dangerous dog to me. Why do you write a sign like that?" "Because," the owner explained,"before I make writing it, people often stumble this dog."