My uncle, like 12 years ago, had this MASSIVE 200 lb Rottweiler named Amos. And no, he wasn't 200 lbs of fat. Solid muscle.
When we used to go visit him, he stuck his big enormous head into the car window (I was like 2, so I was terrified. The damn thing looked like he was part grizzly bear). The first time my grandma and mom saw him, they almost fainted.
He was the sweetest dog ever though. One time he saw some girl jogging by their house, and he chased after her. (just imagine looking behind you and seeing that monster chasing you). He started licking her face, and giving her "dog kisses", but she thought he was going to eat her. She was scared to death.
And another time, a freakin golden retriever wandered into their yard, and started to fight Amos. And Amos got his ass kicked, that retriever stomped his ass. Amos was walking around the yard crying. How pathetic is that?