Dogs are pack or family animals which means that they are social and desire the company of other dogs or of humans. Many people leave dogs alone at home and do not understand that this may result in a psychological problem for the animal. There is a medical term for such a condition. It is known as

. This problem may result in destructive behavior.

You must have observed that your dog can get aggressive when it is frightened. This behavior is called dog fear aggression. Growling, tail tucked between the legs and ears pulled back are the signs of

.