Dogs are predators who follow rules of survival.
They are used to fighting and the fight includes growls and bites: attitudes that are not acceptable when expressed towards the master, the people more or less close or his fellowmen.
Aggression can be divided into:
aggressiveness of dominance : it originates from an incorrect education of the dog that does not see its leader in the master
aggression out of fear : manifests itself with an excessive reaction of the dog to contact with people or animals because it associates people or animals with an unpleasant experience
overprotective aggression of the territory or of the owner and his family. If excessive this is due to the fact that he proclaims himself leader of the pack
predatory aggression : occurs against small prey or moving subjects
redirected aggression : in this case the intervention of the veterinarian is necessary. An extreme but functional remedy is castration.