I am going to take this out of my aggression book from Brenda Aloff.
"Dogs developed assertive and aggressive behaviors to assure their success as social, family-oriented, pack animals. In addition, several other factors are known to influence aggression in dogs. These include:
Social Development Periods
Stress and Fear
Resiliency and Training
I just want to touch on this one: Resiliency and Training
Some dogs are very brittle-they respond with fear or aggression to small stimuli across a wide variety of situations. Brittle dogs do not "rebound" well. That is, once stressed, the recovery time is slow. Other dogs are very resilient and can tolerate a lot of frustration and provocative stimuli without becoming aggressive or fearful. What makes some dogs more reselent? Resiliency comes, in part, from inborn chemical factors of the dog, making some individuals just more likely to be temperamentally resilent.
The sum of the dog's past learning experiences is a huge contributor to resiliency. Dogs who are socialized well and early to a lot of dogs, novel experiences, and a wide array of humans, develop reliliency to stress. Dogs who have a sound temperament and a preponderance of pleasant social interactions will not be overly affected even by a traumatic event."
This for me is what I am dealing with my rottie. He has poor trial and error system. It takes him almost a week down time to get over an aggressive outburst, if not more. I have to take working with him to a minimal at a time. I am working against temperament. He redirects his frustration. I can not change what he went through as a puppy. Aggression is so complex and there are so many forms of it and how different each dog is when it comes to their own issues. It's truly facinating.