Caucasian Shepherd Dogs are known for their strong protective instincts and can display aggression when they perceive a threat to their family or territory. This trait is a result of their historical role as livestock guardian dogs. While they are not inherently aggressive without cause, they require early socialisation and consistent, firm training to ensure they differentiate between real threats and everyday situations. Properly raised and trained Caucasian Shepherds can be loyal, gentle and well-mannered companions. However, it's essential for owners to understand and manage their protective nature to prevent any potential aggressive behaviour.