The following is the Standard or descriptive ‘blueprint’ for the Dogue De Bordeaux. This is the English translation of the Standard adopted by the Federation Cynologique Internationale [FCI]. I have taken the liberty of correcting what I see as an error in the translation in regard to the parallel lines in the head.
In the FCI Standard, the first sentence of the paragraph under the heading HEAD is as follows:
Voluminous, angular, broad, rather short, trapezoid when viewed from above and in front.
I have changed that to read:
Voluminous, angular, broad, rather short, trapezium when viewed from above and in front.
As we know a Trapezoid is a four sided figure with no sides parallel and a Trapezium is a four sided figure with two sides parallel. Clearly Trapezium is the correct word.
The Standard is in bold and comments / explanations are not bold. Diagrams, photographs and comments marked  are taken from the book The Saga Of The Dogue De Bordeaux by Raymond Triquet and published by Bas Bosch Press. That book is accepted as a foremost authority on the Dogue De Bordeaux.
I hope you find this informative and helpful in understanding the characteristics of this great breed.