Fear-induced aggression occurs in situations where the dog is trapped and attempts to flee are impossible. He will then attack either the other dogs or humans, but there will be no threat phase. The attack is direct and unpredictable. Violent wounds are inflicted because he does not control his bite.
One of the phases (threat or appeasement), may also be left out as a result of a type of learning known as effective conditioning. Looking at the example of hierarchical aggression, dogs are known to manifest aggressive episodes when certain leader prerogatives are challenged.
At the beginning, the aggression sequence is complete, with all three phases. However, if the conflict repeats itself and the human-dog relationship is not modified, the dog will progressively alter his sequence of aggression. The owner's "flight" reaction after being bit becomes the element of reinforcement needed for the development of effective conditioning. The appeasement phase diminishes, then disappears. The intimidation phase will be modified and will become almost synchronous with the biting. Then it too will disappear. The bite becomes serious and unpredictable.
The dog has now become a dangerous animal.
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