Which type of aggression is characterized by a dog reacting aggressively when it feels threatened?

Fear aggression is characterized by a dog's response to feeling threatened or fearful. In such situations, a dog may perceive a person or another animal as a threat, leading to aggressive behavior as a means of defending itself or trying to escape the situation. This type of aggression often arises from a lack of confidence or past negative experiences and manifests when the dog feels cornered or anxious.

In contrast, possessive aggression occurs when a dog feels the need to protect its resources, such as food or toys, from perceived threats. Predatory aggression is driven by an instinctual urge to hunt or chase down prey. Redirected aggression happens when a dog is unable to reach a target of aggression and instead directs its aggression toward a nearby person or animal. Each of these other types focuses on different triggers or motivations than the fear-based response indicated in the correct answer.