The lesson I believe the writer is trying to convey in the The L0st Dog is fairly on the nose; 'to never lose hope on something you don't know 100%. In paragraph five and six the protagonist is seen running from a group of aforementioned men, barely escaping he end up reunited with his friend Rose, ending the story with the line "[...] Never give up hope on something you haven’t found."
Now I didn't 'explain' 'cause It'd sound redundant but if you want or need to, just add on with '...which means' or '...is/that's an example of,' et cetera.
Based on the given excerpt above which is taken from "To Kill a Mocking Bird", it shows the Scout is evoking the shooting of the rabid dog. This is the scene about the Mad Dog. The answer would be the third option. Hope this answer helps.
