Aggressive canine behaviors will only manifest in your dog if you are a kind of a master or dog owner that treats your dog badly.
You see you may not realize this yet but they do know how to understand any kind of behavior that their master may be showing them. They know how to resent and fight back if they feel like they are being threatened or not being treated fairly. They can feel if you have something against them therefore their behavior will entirely reflect on you as the owner, if they are being pampered and treated with love and care as well as humane treatment. They have no reason to get intimidated or resent since they could feel that they are well loved and taken care of.
However despite of all of the good treatments that you may have shown to your canine and it still manifests aggressive behavior you cans eek the help of professional dog trainers as well.
Why wait for something bad to happen if you cannot help but notice that something is terrible bad with your favorite pet. Aggression dog training can be sought once you find that your canine is indeed beyond help. There is no time to waste before it may do something horrible that might result in something you may have never expected.
The only way to prevent such thing to happen is by enrolling or admitt9ing your dog to a training camp where they deal such types of dog behavior.
You may try to train your dog yourself but it will require much time and patients since you literally have to gain back the trust and the respect of your dog.
Remember that in every behavior good or bad there is always something that might have triggered it or make it manifest in every animal. The only way to totally get rid of it is by seeking the advice or help of any professional to be sure that your dog will restore its former behavior.