Dr. Rodriguez began by observing the troop from a distance, taking note of their behavior, diet, and environment. She collected samples of their food and water, as well as tissue samples from Kiko's wounds. She also set up camera traps to monitor the chimps' activities when she wasn't present.

Consider leash reactivity. A dog barks and lunges at other dogs during walks. The owner, embarrassed, tightens the leash. The dog feels the tension (a stress signal) and sees the other dog. The dog barks louder; the other dog leaves. The dog learns: Barking makes the scary thing go away. A veterinarian educated in behavior doesn't just recommend a muzzle; they teach the owner about trigger stacking and counter-conditioning. By changing the owner's behavior, the dog's stress decreases, preventing the chronic hypertension and repetitive strain injuries that reactive dogs often develop.

For decades, veterinary medicine focused primarily on the physical health of animals. If a dog stopped eating, a veterinarian checked for parasites or infections. Today, the field has evolved. Veterinary science now recognizes that physical health and animal behavior are deeply interconnected.