Is there a sequel to Animal Farm?

Previous answer: No, there is not a sequel to animal farm. There is no need for one. This book is not only a story, it's a statement about the Russian Revolution. That's why no sequel is needed.

My addendum: The above answer is incorrect on several points. First, though there are no sequels to Animal Farm by the original author, there are a couple sequels by other authors: Snowball's Chance by John Reed(which treats capitalism to similar critiques as fascism, socialism and communism in the original) and Anarchist Farm by Jane Doe(which does the same for anarchism).

Secondly, so the book is a statement about the Russian Revolution; how does that mean no sequel is needed. Leaving aside the skill(or lack of) that the authors I listed above tackle their subject matter, the subject matters themself are worthy of the Animal Farm treatment, so they are needed. Saying that just because the book is an allegory for the Russian Revolution, no sequel is needed is like saying that nothing happened in the world since the Russian Revolution or that because a historian has documented the Russian Revolution, it's not necessary to document anything after that.