Actually I had a dog about that size, not quite so 'fat', but taller and about as heavy.
Beuford brentwood something or other on his AKC papers (only registered dog I've ever been interested in)
Old english mastif, his shoulder was belt level on me and when he stood up on his back legs he could look nearly anyone in the eye.
He was EXTREMELY good at clearing the street on looks alone, which was good because the only way he'd hurt anyone was if he stepped on your foot.
Real funny thing happened with him at a gas station once, I had a CJ7 with a bikini top on it, and was pumping gas, Beuf was halfway in the passenger seat watching me, and some dude walked up to the passenger side near Beuf, and started asking directions. Beuf turned around and looked at him, the guy stopped in mid word dropped his pop and map, and took off running accross the parking lot yelling 'OH SH*T OH SH*T OH SH*T
Ended up buying the guy another pop, but had a hard time keeping a straight face.
Ken.