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Fear-Motivated Aggression: Fear-motivated aggression is a defensive reaction and occurs when a dog believes he is in danger of being harmed. Remember that it's your dog's perception of the situation, not your actual intent, which determines your dog's response. For example, you may raise your arm to throw a ball, but your dog, perceiving this to be a threat, may bite you because he believes he is protecting himself from being hit. A dog may also be fearfully aggressive when approached by other dogs.

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!

Redirected Aggression: This type of aggression is relatively common, but is a behavior that pet owners may not always understand. If a dog is aroused into an aggressive response by a person or animal that he is prevented from attacking, he may redirect this aggression onto someone else. A common example occurs when two family dogs become excited, bark and growl in response to another dog passing through the front yard. The two dogs, confined behind a fence, may turn and attack each other because they can't attack the intruder. Predation is usually considered to be a unique kind of aggressive behavior, because it's motivated by the intent to obtain food, and not primarily by the intent to harm or intimidate.

Individual Variation Dogs differ in their likelihood to show aggressive behavior in any particular situation. Some dogs tend to respond aggressively with very little stimulation. Others may be subjected to all kinds of threatening stimuli and events, and never attempt to bite. The difference in this threshold at which a dog displays aggressive behavior is influenced by both environmental and genetic factors. If this threshold is low, a dog will be more likely to bite. Raising the threshold makes a dog less likely to respond aggressively. This threshold can be raised using behavior-modification techniques. How easily the threshold can be changed is influenced by the dog's gender, age, breed, general temperament and by whether the appropriate behavior-modification techniques are chosen and correctly implemented. Working with aggressive dogs can be potentially dangerous and should be done only by, or under the guidance of, an experienced animal-behavior professional who understands animal-learning theory and behavior.

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