Step 1 : Introduction to the question "9. For which of the following dog behavioral problems is a professional consultation recommended?"
...1. Aggression 2. Jumping up 3. Barking 4. Chewing While most dog behavioral problems are safely dealt with by the average owner, aggression problems, especially towards people, are best handled with the assistance of a qualified behaviorist. Such a person can determine the cause of the aggression (dominance aggression, territorial aggression, fear aggression, predatory aggression, etc.) and recommend safe, non-confrontational methods of treatment.