a. The comic is about a dog's behavior and the fact that can be jealous when it comes to their owners.

b. The elements mentioned in the conversation are: both panels and the animal character

To show interest and keep the conversation going:

How interesting; Really?

To ask for more details:

What do you mean?; Why do you say that?; What kind of details, exactly?

To clarify idea:

Let me explain myself; What I mean is that… For instance, in the first panel…