That has changed. We now understand that stress and fear are not just emotional states; they are physiological events.

The answers are revealing. A dog who scratches only when the mailman arrives—or when the toddler approaches his food bowl—does not have a primary skin disease. He has a behavioral pathology manifesting as a physical symptom. Treating the atopy with steroids while ignoring the anxiety is like mopping the floor while the sink overflows.

Dr. Sophia Yin, the late pioneer of low-stress handling, famously demonstrated that a cat’s blood pressure reading in a standard "scruff-and-stretch" restraint could be artificially elevated by 30-40 mmHg—enough to misdiagnose hypertension and prescribe unnecessary, harmful medication.

Using target training (touching a nose to a stick) and positive reinforcement, veterinarians now teach a diabetic cat to present its ear for a glucose prick. They train a arthritic Great Dane to walk onto a scale voluntarily. They teach a parrot to hold still for an x-ray.