In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.
Q: Sentence1: Jimmy wanted a pet dog. Sentence2: He promised to take care of it. Sentence3: His parents got him one as long as he kept his word. Sentence4: Jimmy stopped taking care of the dog. Sentence5: His parents were forced to take it away.
A:
His parents, Jimmy, Pet dog