The Ruf Bon Dufus the thre magical tome that magically records in itself all the magic of the doggies' world as they learn it.
Opening Passage and other stuff
The opening passage
The third page of the Ruf Bon Dufus quotes the phrase 'porus bon trio', which is written in Rufus Latina.
The second page of the book also shows the 'trio bon Ruf'.