Seems right, there is neither violence, or supportive context in this text or familiar.
If this is a true/false question, I'd say true
Answer:
The major theme of this story is bravery. Dennis, Mac, Jeremiah, and Anna had to be brave. In the text, they leave the ranch to find humans. If they stayed, they might have not been able to help people.
Explanation:
Need more info to the question