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: John ran to find his dog. His dog was trapped in the river. John alertly called for his father. His father helped John rescue his dog. John's dog was very happy to be safe from the river.
 selected sentence: His dog was trapped in the river.

John ran to find his dog >Causes/Enables> His dog was trapped in the river.