Animal Farm follows a typical plot structure, but along the way the animals’ lives become less and less idyllic. There is an anonymous third person narrator, and the style is very concise and straight-forward. The tone, or author’s attitude toward the subject, is nonjudgmental and matter of fact.
The book is allegorical, and he is comparing the animals’ misadventures with human revolutions. Stylistically, Orwell makes great use of irony. There is dramatic irony because we know that the animals are becoming more and more totalitarian, but the animals do not.
As the story moves along the simple plot structure, the initial conflict of abusive humans is revolved but cycles back as the pigs turn into the humans. So in a way, the story ends where it begins in a cyclical manner.