Is Dennis the Menace a fiction book?

Dennis the Menace is a comic strip, which is a type of sequential art that tells a story through a series of panels. It's not a fiction book in the traditional sense, but it's definitely fictional.

Here's why:

* Characters and storylines are invented: Dennis, his family, and his friends are not real people. Their stories and adventures are made up.

* Humor and exaggeration: The comic strip relies on humor and exaggerated situations, typical of fiction.

* Published regularly: Like books, comic strips are published regularly, but in a serialized format.

So, while not a book, Dennis the Menace is a form of fiction.