Aggression from dogs is divided into two groups: the type regarding the interaction between dogs and the other related to their interaction with humans, although some affect both.
Aggression from Physical Pain: such a form of aggression is born in response to a pain stimulus caused voluntarily or involuntarily. This response will be different according to the temperament of the dog: Very Dominant (VD) will be very violent with direct bites to the face or neck (vital areas), Dominant (D) will be violent with bites to the arm or legs; if the subject is submissive (S) it will yelp trying to wriggle, if he is Very Submissive (VS) will yelp licking his hand.
Aggressive Competition for the Female: this aggression is completely natural and will show itself just when two or more males are in contact with a female in heat. In such situations it’s advisable not to intervene, because the males will “face each other” without major physical consequence.
Aggression of Competition for Food and for the Defense of Offspring: these forms are of natural ethological motivation, provided they are contained within the physiological limits.
Aggression in Defense of Territory: this can create many problems since the territory is represented by the garden or the surrounding are in which the dog lives: if the dog is Very Dominant (VD) or Dominant (D), it will defend the territory independently from the will of the proprietaries, creating a daily high risk situation. The Submissive (S) subjects tend to defend their territory correctly, just in a dangerous situation when their parents are not at home. While those Submissive (S), Very Submissive (VS) or Inhibited (I) certainly don’t create problems related to fear aggression, they can create the opposite situation, accepting joyfully thieves or unwanted people!
Fear Aggression: a dog with an unhealthy psychological balance perceives the presence of unknown stimulus (persons or noises) as stressful. This can lead to an aggressive reaction that is proportional to the level of character imbalance.
The official standard of every canine breed explains, next to the physical parameters, the behavioral and functional character. In no dog breed figure is aggression a talent in demand.
The optimum for any breed, from Poodle to Rottweiler, is always a healthy psychological balance, while any sign of aggression manifested during a dog show will result in disqualification. This means that no dog breed is aggressive by definition, but that among each individual race, may be born overly dominant individuals. This trait makes them incapable of performing the task they have been selected for. In the 70’s, the birth of Very Dominant (VD) subjects was very limited and unmanageable dogs were an exception. In the 80’s and 90’s, their number increased exponentially, affecting the majority of subjects. In that period, the probability of having a dog with a problem in the family was consequently very high. The circumstances were often that dog was good and affectionate because it did what it wanted, but took control of the family and the territory, biting anyone who went against it, or forced it to do something unpleasant. As further consequence, he prevented access to the house to whoever he believed unpleasant. The children were inevitably the first to undergo this situation, having a strong risk for bites. Fortunately, the described situation has progressively decreased in the last decade, providing, however, far from the physiological numeric: dominant dogs are always in large quantity.