The Dogue de Bordeaux is intelligent and they are quick to learn, bearing in mind that this means they can quickly pick up bad habits too. As such, their training and education has to start as early as possible and they need to be handled and managed calmly. Dogues love to please and because they are such loyal characters by nature, they form a very strong bond with their owners which also makes it that much easier to train them.
However, it's essential for puppies to be well socialised from a young age and this has to include them being introduced to new situations, people and other animals for them to grow up to be well-rounded characters in all sorts of different environments.