: Reward dogs for "settling" or lying down quietly.
At the heart of this synergy is the recognition of behavior as a primary diagnostic tool. Unlike human patients, animals cannot verbally communicate their discomfort or distress. Consequently, behavioral changes often serve as the first—and sometimes only—clinical signs of an underlying physical ailment. For instance, a feline patient showing sudden aggression or hiding may be suffering from chronic renal pain or osteoarthritis rather than a temperament shift. By integrating behavioral science, veterinarians can move beyond superficial symptom management to identify the root causes of distress. This "behavioral vital sign" is now considered as critical as heart rate or temperature in a comprehensive physical exam.