I have never read what you are asking, but just by looking at it, I would assume that he is stereotyping Dutch people, because he is calling Black Dog an insult, which is "son of a dutchman".
Cathedral definition. A Christian church building in which a bishop has his official seat (cathedral is Latin for “chair”). A cathedral is usually large and imposing, and many cathedrals are important in the history of architecture. (See Chartres, Notre Dame de Paris, and Saint Paul's Cathedral.)
Sixteen plus eleven, subtracted from thirty five. Or thirty five minus the sum of sixteen and eleven.
