If your dog shows signs of aggression then you should get help from a behavior consultant right away. Signs directed toward you or another person that indicate the need for professional help include the following:
Resource guarding is very dangerous. If you have a puppy you can take steps to prevent this, or stop it if is already starting. Teach your puppy that it is a good thing when people approach his food bowl or his possessions. Read an article about this. If you have an adult dog that is guarding people, possessions or territory then you need to hire professional help. This is a dangerous situation that can rabidly escalate. Visit the parent information page and the dog owner information page for more on this.
If your dog has ever shown the signs listed above, or you have that
feeling in the back of your mind that your dog is likely to bite someone, then
you should get help from a professional.You may think it is expensive to pay a consultant, but it will be even more expensive (in more than just financial ways) if the dog bites someone.