What is a short summary of the story, Eyes of Dogs, from the collection, One Hundred Apocalypses and Other Apocalypses?

The story, Eyes of Dogs, tells the story of a soldier coming home from war. The story takes place in a fairy-tale universe, for on the way home, the soldier meets a witch. The witch tells the soldier if he falls into the bottom of a well and confronts three dogs, he will become rich. The soldier obeys the witch's commands, faces the dogs, and resurfaces with money and a magical purse. He then kills the witch and spends his money in town. However, when he needs the money most, the soldier finds it has all disappeared.