Territorial behavior is a normal canine behavior, though territorial aggression can result in injury to a person or animal. Many dogs that exhibit territorial aggression have an underlying fear or frustration that contributes to their level of arousal. Territorial aggression may be preventable if recognized and addressed early.

Aggression may be defined as any threat or harmful behavior directed toward another individual or group. Aggression in dogs commonly includes body language or threat displays such as a hard stare, growling, barking, snarling, lunging, snapping, and/or biting. There are many different categories or types of canine aggression including territorial, possessive, maternal/protective, pain-related, predatory, frustration, social conflict-related, sexual, disease-related, and fear- or anxiety-related aggression. The most common presentation of aggression is fear or anxiety motivated. The treatment of aggression will depend on the cause of aggression. Aggression should first be discussed with your veterinarian regarding the most appropriate treatment.