Counter-conditioning at threshold — change the emotional response.
Leash reactivity is one of the most stressful dog behaviour problems for owners — and one of the most misunderstood. A reactive dog lunging, barking, and spinning at the end of a leash looks aggressive. Usually, it isn't. Most leash reactivity is a fear or frustration response, often made worse by the leash itself.
The leash creates a situation dogs don't naturally encounter: they can see something threatening (or exciting, or unpredictable), but they can't approach normally or flee. The inability to use normal social distance creates an arousal spiral. Over time, the sight of the trigger becomes a conditioned predictor of that arousal — the dog reacts before the trigger is even close.
The training protocol is counter-conditioning: changing the emotional response to the trigger by pairing its appearance with something highly positive, consistently and at a distance where the dog can still think. This is threshold work. If your dog is already reacting, you're over threshold and the session is over. The goal is to work below the point of reactivity, consistently, until the emotional response changes.
Threshold is the distance at which your dog notices the trigger but can still take treats and respond to you. This might be 50 feet. It might be 200 feet. Don't assume — test it. Watch for early signs: ears forward, body tension, hard stare, weight shifting forward. These happen before the bark and lunge. That's your working threshold. Below that distance, you're training. At or above it, you're just surviving.
Every time the trigger appears at or below threshold distance, immediately feed high-value treats continuously until the trigger is gone or moves further away. The trigger's appearance predicts the good thing — not your cue, not sit, not any behaviour. Trigger appears, food starts. Trigger disappears, food stops. You're pairing the stimulus with something the dog values, at a distance where they can still process it. Repeat this hundreds of times.
Between training sessions, manage your walks to avoid over-threshold experiences. Cross the street early, change direction, create distance proactively. Every over-threshold experience undoes multiple training sessions. Progress in counter-conditioning is slow: expect 4–12 weeks before you see consistent improvement. If your dog has a history of lunging and making contact, work with a certified behaviour consultant.
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