Owning Mastiffs is as much about being an ambassador of the breeds as it is about the companionship. Socialization is sooo important. Everywhere I go with my dogs, (EM/Anatolian Shepard mix, and my bullmastiff), people want to know what kind of dogs they are. They ask me to pet them, they want to have conversations about large dogs, and usually it's to do about some horror story. I spend a few minutes to introduce my dogs, an show how well disciplined they are.
It's almost like when I have a friend who is completely anti-gun. The fist thing I try to do is take them shooting. The next thing I know, they want to buy one of my firearms. It's the same with large dogs. These animals are big, powerful, beautiful, and almost assure the respect of everyone in the area. We have to be ambassadors, responsible, and honest with ourselves about what these large dogs can be capable of when defensive.