If your dog barks, lunges, growls, or “loses it” when they see other dogs on lead, you are not alone — leash reactivity is one of the most common behavioural issues in UK dogs. It is also one of the most misunderstood: reactive dogs are almost always acting out of fear, anxiety, or frustration, not aggression. Many reactive dogs play beautifully off-lead but become explosive on the lead because the lead removes their ability to choose flight, creating a fight-or-freeze response. Reactivity is manageable with the right approach.
Understanding Threshold
Every reactive dog has a threshold distance — the distance at which they notice the trigger but can still remain calm:
- Under threshold: Dog sees the trigger, remains relaxed, can take treats, responds to cues. This is where all training happens
- At threshold: Dog is alert, tense, may stare — close to reacting but hasn’t yet
- Over threshold: Dog is barking, lunging, spinning — no learning is possible here. The brain is flooded with cortisol. Your only job is to create distance
The most common mistake: training when the dog is already over threshold. All reactive dog training must happen under threshold.
Counter-Conditioning & Desensitisation (DSCC)
The goal: change your dog’s emotional response to the trigger from “DANGER!” to “oh, that thing means chicken”:
- Position yourself at a distance where your dog notices the trigger but remains calm (under threshold)
- The instant your dog sees the trigger, feed high-value treats continuously. Trigger appears → treats rain. Trigger disappears → treats stop
- Over time, the dog begins to associate the trigger with food. You’ll see “the head turn” — dog sees trigger, looks at you expectantly. This is the breakthrough moment
- Gradually decrease the distance to the trigger over weeks — never push past the point where your dog can cope
BAT (Behaviour Adjustment Training)
Developed by Grisha Stewart, BAT focuses on giving the dog control:
- Set up controlled scenarios at a safe distance. Let the dog observe the trigger and choose to disengage on their own
- When the dog makes a good choice (looking away, sniffing the ground, turning away), reward by increasing distance
- The dog learns they can control their environment through calm behaviour
Management Strategies
- U-turn: When you spot a trigger, turn and cheerfully walk the other way before your dog reacts. Teach “this way!” as a cue
- Create barriers: Step behind a car, hedge, or wall to block the trigger from view
- Walk at quiet times: Early morning, late evening, or mid-afternoon when parks are emptier
- Yellow ribbon/space-giving signals: Yellow lead accessories signal to other owners that your dog needs space
FAQs
Will my reactive dog ever be “cured”?
Reactivity is managed rather than cured — but management can become so effective that the dog lives a completely normal, happy life. With consistent counter-conditioning, many dogs improve dramatically. Some may always need more space than average, and that’s fine. The goal isn’t perfection — it’s a dog that can walk past triggers without distress. Most owners see significant improvement within 3–6 months of dedicated work. If you’re struggling, an APBC or ABTC registered behaviourist specialising in reactivity can create a tailored plan.
Reviewed by Dr. Sarah Jenkins, MRCVS
Dr. Jenkins is a fully practicing veterinary surgeon in the UK with over 15 years of clinical experience in small animal medicine and canine behaviour. She reviews and verifies our health content to ensure medical accuracy.
