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: Bob had a wonderful pet dog named Bomber. Sentence2: He decided Bomber need a new friend. Sentence3: Bob went to pound and decided to take a new chihuahua home. Sentence4: He named the new dog Fred and introduced him to Bomber. Sentence5: The two were cautious at first but soon became close companions.
A:
Bob, Bomber, Fred