At first, Sarah thought that Max might be in pain or discomfort, but a thorough physical examination by her veterinarian, Dr. Johnson, revealed no underlying medical issues. Dr. Johnson then suggested that Sarah consult with a veterinary behaviorist, Dr. Rodriguez, to help identify the root cause of Max's aggression.
Today, a veterinarian or animal scientist looks at four primary categories of behavior: (PDF) A History of Animal Welfare Science - ResearchGate At first, Sarah thought that Max might be