Leash meltdowns aren’t random—they’re rehearsed. We pull back the curtain on what “reactivity” really means, why barriers like leashes and fences supercharge emotion, and how to swap chaos for structure without crushing your dog’s spirit. We map the two major lanes of reactivity—overarousal versus fear—then connect them to what’s happening inside the body, from dopamine-fueled excitement to cortisol-driven stress. That biology lesson turns into timing and tactics you can use today. We start ...