heard that Dobermans are so violent and nasty.?

While Doberman Pinschers can be protective of their family and territory, they are not inherently violent or nasty. Like any breed of dog, their temperament and behavior are largely influenced by their upbringing and training. Dobermans are intelligent and loyal dogs that can make excellent family pets when properly socialized and trained. However, it's important for Doberman owners to understand the breed's potential for guarding and territorial behaviors and to take steps to ensure that they are properly trained and socialized to prevent any aggression issues from developing.