Bronco is a neutered, Great Dane/Bull Mastiff mix and, I have to tell ya, he got all the best of both breeds. He's our old man, having just turned 8 in May. Thank goodness, he's still going strong.
Bronco has one of the best temperaments on a dog I have ever had. With one exception, feet. Touch him with your foot and he flies up and leaves the room with a look of absolute horror on his face. It's one of the funniest things you'll ever see!