Alleviate fear aggression by slowly socializing your dog, which will help them understand that other dogs, pets, and humans don’t always mean harm. To lessen your dog’s territorial reaction, reward calm behavior when visitors come to your home and enroll them in obedience training. Idiopathic aggression can be severe, with a possible neurological reason behind the behavior, and warrants talking with your veterinarian. The only effective way to stop predatory aggression is avoidance of the environment causing the behavior. Intra-household aggression can be alleviated by separating your dogs and slowly re-socializing them until their interactions are calm. To manage resource guarding aggression, simply pick up your dog's toys, food bowls, and other possessions when your dog is not using them. Aggression is the most common behavior problem in dogs and the most serious, seek the help of behaviorists, trainers, and veterinarians before resorting to a local shelter.