Dog aggression is a term used by dog owners and breeders to describe canine-to-canine antipathy.
Aggression itself is usually defined by canine behaviorists as "the intent to do harm". Many dogs show "displays of aggression" such as barking, growling, or snapping in the air, which are considered distance-increasing actions, those that intend to get the person or dog to move away from the dog. Some dog-aggressive dogs display aggression that is mainly defensive, and they harm another dog only if they perceive that they have no option. Yet, other dogs may develop dog-aggressive behaviour due to medical reasons, such as hormonal imbalances.
Dog aggression is a common dog behavior, and can be seen in all breeds of dogs, although some dog breeds have a predisposition to display such aggression. The breed standard usually spells out whether dog aggression is common in the breed and to what degree it is allowed. Most of the terrier breeds and the bull breeds are believed to have a higher likelihood of developing dog-aggression upon reaching maturity. Individual dogs may or may not display the level of aggression that their breed standard suggests. It is the owner's responsibility to ensure that these types of dogs are properly socialized and given a proper amount of exercise.
As well as breeding, a dog's experiences may affect his chance of developing dog aggression. A dog that is attacked as a puppy may develop fear-based dog aggression towards all dogs, or perhaps only towards dogs that resemble the dog that attacked him. Although people tend to bring these reactions out of dogs more often than dogs themselves, dogs only pay attention to what their owners allow.
Dogs that display dog-aggressive behaviour do not necessarily show aggressive behaviour towards humans. The two types of aggression are not necessarily related, and do not always occur in the same animal.
Read more about Dog Aggression: Factors Contributing To Aggression, United States
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