Most dogs, and some cats, on their own territory are more likely to fight than retreat. When approached rapidly, a dog or cat may go through the stages of aggressive behavior very quickly and bite without the intruder being able to react. This happens in encounters between people and their pets because they may approach too close, too fast. Dogs and cats that are mildly fearful may calm down if the intruder shows no fear, waits until the pet settles, and then offers a food reward. Reaching for a dog or cat, while continuing to advance is most likely to lead to aggression.
Standing still is often the best way to reduce aggression in the dog that is chasing.
Cats will often flee if given the opportunity. However some cats will stand their ground and will scratch or bite if reached for. In some cases, despite standing still, avoiding further advance or retreating, the aggression continues. Since aggression depends on the situation, the pet s level of motivation, previous experiences and the type of aggression, it will be necessary for you to provide a detailed history to your veterinarian in order that an accurate diagnosis, and appropriate treatment plan be established. Details on the diagnosis and types of aggression in dogs and cats can be found in other articles.