Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: Bob went out of town. He left his dogs at his house. Someone had been by to check on them. But then bob got back. He found that one of his dogs had broken its tail.
 selected sentence: He found that one of his dogs had broken its tail.

One of Bob's dogs breaks its tail >Causes/Enables> Bob finds out about the broken tail