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: Rover's water bowl was empty. Sentence2: He tried very hard to get his owner's attention. Sentence3: Nothing he tried worked. Sentence4: He then rolled over and played dead. Sentence5: Rover finally got his owner's attention and the water.
A:
Owner, Rover