The Rottweilers large size and strength make this an important point to consider, an untrained, poorly trained, or abused Rottweiler can learn to be extremely aggressive and destructive and, if allowed to run at large, can pose a significant physical threat to humans or other animals.
They can be strong-willed and should be trained in a firm and consistent manner. The owner must be perceived by the dog as the leader. If the owner fails to achieve this status the Rottweiler will readily take on the role. Aggression in Rottweilers is associated with poor breeding, poor handling, lack of socialization, natural guarding tendencies, and especially abuse.