Teach "speak" and "quiet" commands. Do not encourage aggressive barking at people.
Barking
Reward your dog for walking property perimeter lines on cue. Teach territoriality.
Patrolling
Mark and reward your dog for appropriately alerting you to unusual sounds.
Noise Alerts
Train them to stand, face an intruder, and bark until you give a release command.
Alert Stance
Only reward acting protective of family members, not aggressive without cause.
Protect
Consult an experienced trainer to instill guarding instincts safely using positive methods.
Professional Help
Ensure excellent obedience. A disciplined guard dog is critical for safety.
Manners