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Territorial Aggression
In dogs, this involves aggressive displays (any combination of menacing barking, lunging forward, growling, snapping, biting) to individuals entering an animals yard or home. It can also happen as an individual enters a room where the dog is. Territorial aggression can usually be distinguished from protective aggression by determining whether the behavior occurs on walks away from the home area and/or in other locations (places not regularly visited by the dog). Occurrences in the car can be either, but are often territorial. Territorial Aggression is often linked with other territorial behaviors such as urine marking. Both dogs and cats may mark their territory. This is usually not a problem if the urine marking occurs outdoors on the property. But it becomes a major problem when animals begin doing it indoors. This is a common complaint often associated with territorial disputes between cats in a given household.