The reasons for aggression
The majority of dog breeders support two main points: first, almost all dogs have the instinct of defender, and secondly, with the help of qualified training this instinct can be increased to a high degree of efficiency. A dog from its birth has its own particular temperament, which, depending on breeding and training can be changed. In the process of training special relationships between the dog and the owner appear. Four-legged animal quickly discovers the likes and dislikes of its owner and quickly adapts to his/her mood.
For example, a nervous person can hardly expect that his/her own dog would be calm and balanced. Dog keepers, who have prejudices against a particular race or social layer, can even pass on their dislike to animals. You should not try to give the dog qualities you don't possess yourself. The dog easily grasps not only the characteristics of its owner, but his/her mental structure as well.
This, of course, is not a satisfactory answer to the question why some dogs react aggressively all of a sudden, especially if this quality wasn't observed in them before. Some people believe that this sudden anger comes from the supposed ancestor – the wolf. Others think that this behaviour can be explained by an unusual environment or a new owner. Which is how, don't yield to uncertainty if you have a dog or think to buy it. Unexpected aggression happens seldom and you can enjoy your dog with your children.