In modern medicine, the line between a pet’s physical health and its psychological well-being has nearly vanished. Veterinary Behavioral Medicine has emerged as a critical discipline that treats behavior not just as a training issue, but as a clinical indicator of overall health. This evolution recognizes that behavioral changes—such as sudden aggression or lethargy—are often the first visible signs of underlying disease, chronic pain, or neurochemical imbalances. The Clinical Link Between Stress and Disease

Aggression is the number one reason pet owners seek euthanasia and behavioral euthanasia. Yet, in the intersection of , aggression is reclassified as a symptom, not a diagnosis.