Bullsh*t! I grew up with one as a pet when I was 7 years old. There wasn't a viscious bone in that dogs body, at least not toward anyone who didn't try something foolish like breaking into the house or trying to harm anyone in the family.
No, it is very true about Dobermans. My grandfather raised them. Every once in a while one would just be mean and you had to take special precautions when friends and strangers came over. Nobody was allowed out of the car until that one dog was put up the rest were no problem and very friendly to everybody. He was afraid of what that dog would do even to us grandchildren, I think he finally put it down the second time it attacked somebody who came over to the house to see him.