Some time ago I saw a beautiful, big, black dog that I didn't know. Once at home I scoured plenty of photos of the different breeds, and found out that is was a Greater Swiss Mountain Dog! Here's an extract of what Wikipedia says about this breed:
The Greater Swiss Mountain Dog, or Großer Schweizer Sennenhund, is the largest of the traditional Swiss herding breeds, the Sennenhunds, a grouping in which the Bernese Mountain Dog, Entlebucher Mountain Dog, and Appenzeller Sennenhund are also included. The Greater Swiss Mountain Dog has a reputation of combining protectiveness with a gentle nature, particularly with respect to its love of its family, especially children. These dogs are strong, active, and remarkably agile for their size. They are protective of their family and training is important for them to learn their place.
Wow, beautiful, strong & protective but gentle and loving! This sounds like a perfect match for what I would desire from a dog!
Here are some videos: