Curing Aggression
Aggression contrary to what is portrayed in TV is never cured. Dogs do not always make this nice friendly pack without confrontation. The triggers to aggression can vary from fear, prey, territory, maternal, dominate or anti social, to learned. What is often not understoodd about aggression is the behavior is self reinforcing. Behaviors that are reinforcing will repeat themselves. It is extremely difficult to use pure positive when addression aggression. On the other hand if negaitve is not used correctly and fairly the aggression can worsten and become directed at the handler.
Dogs with overt aggressive traits may never be able to just go and play with strange dogs. It may never allow strangers to pet it. However it can learn it must tolerate their presence and not show aggression towards them. The reason dogs cannot be trusted after showing aggressive acts is something known as spontaneous recovery