Not easily located (unless you look on the Internet), Olaf Stapledon wrote an extraordinary book titled
Sirius.
http://en.wikipedia.org/wiki/Sirius_(novel) I read it about 40 years ago and it still resonates today. Recommended with reservation as the story is classified as 'science fiction' by some. Truth be told, the core premise of a dog authoring a book as in
The Art of Racing in the Rain is fantasy too.