Of course, Madgie and Fidele are two dogs whom he hears talking a few months before he convinces himself that he is the king of Spain.  
At the end the narrator pleads to his mother for help before ending this story by informing us that the Dey of Algiers has a wart on his nose.  It features such unusual dates as April 43 in the year 2000 and Martober 86, which only start appearing after the narrator is disappointed by news he reads in letters stolen from Madgie and Fidele.  Of course, Madgie and Fidele are two dogs whom he hears talking a few months before he convinces himself that he is the king of Spain.  FTP, name this Nikolai Gogol short story about the ravings of a lunatic.
At the end the narrator pleads to his mother for help before ending this story by informing us that the Dey of Algiers has a wart on his nose.  
"The Diary of a Madman"