Mastif, his name is Fang. He's Hagrids.
One of my buddies got one for his girlfriend but they didn't train it. Thing is dumber than a box of hair. He got pissed off at me for calling them fucking idiots. In my opinion, that's too big a godddam dog to be untrained. Poor thing hasn't seen longer than its chain and now it's too strong for them to walk and too stupid to be trained.
People who aren't willing to train pets shouldn't get them. I feel the exact same way about children.
I don't like animals but would have a security type dog only if there were time for me and the kids to attend obedience school with it.