Protective, Territorial And Possessive Aggression: Protective, territorial and possessive aggression are all very
similar, and involve the defense of valuable resources. Territorial aggression is usually associated with defense of
property. However, your dog's sense of territory may extend well past the boundaries of “his” yard. For example, if
you walk your dog regularly around the neighborhood and allow him to urine-mark, to him, his territory may be the
entire block! Protective aggression usually refers to aggression directed toward people or animals that a dog
perceives as threats to his family, or pack. Dogs become possessively aggressive when defending their food, toys
or other valued objects, such as Kleenex stolen from the trash!