Dog reactivity — excessive responses to stimuli including other dogs, people, or vehicles — is a common behavioral welfare problem that causes distress for both dogs and their owners. Understanding its origins and management improves welfare outcomes.
Reactive dogs are distressed dogs. Each reactive episode involves acute fear arousal — elevated cortisol, increased heart rate, and the psychological experience of perceived threat — that is genuinely unpleasant for the dog regardless of whether it appears dramatic or manageable to observers. Dogs with frequent reactive episodes live with chronically elevated stress baselines that compromise their immune function, sleep quality, and behavioral flexibility. The welfare-centered response to reactive behavior is prevention of reactivity through management, combined with systematic behavioral modification that genuinely changes the emotional response rather than suppressing its expression. A reactive dog who, through careful counter-conditioning, learns to associate previously scary stimuli with positive experiences is not just easier to manage — it is experiencing a genuine improvement in its daily emotional life.