When did The Horse with the Flying Tail happen?

There is no known book or story titled "The Horse with the Flying Tail". It's possible that you are misremembering the title or that it is a lesser-known work.

Could you provide any more context or details about the story you are thinking of? For example:

* Author: Do you remember who wrote it?

* Genre: Was it a children's book, a fantasy novel, or something else?

* Characters: Do you remember any other characters besides the horse with the flying tail?

* Plot: What happened in the story?

With more information, I might be able to help you find the story you're looking for.