Given the task definition and input, reply with output. 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.

Sentence1: I made a grilled cheese for lunch. Sentence2: I sat down at the table to eat. Sentence3: My dog ran into the room. Sentence4: He looked at me as if to ask if I'd made him a sandwich. Sentence5: I gave him half of mine.
I (myself), Dog