I grew up alongside a rottweiler & used to ride her, sleep on her, do anything to her. She slept under our cots, she was a beautiful dog! Have had dogs all my life & have never been injured or bitten.
But my personal opinion is no dog is safe. Our dog who wouldn't hurt a fly - but I would never leave DS with him alone. I don't let DS near the dog's face & I never let him anywhere near him when he is eating/has a bone.