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If your dog barks, lunges or spins when another dog appears on a walk, the usual cause is fear or frustration made worse by the lead, which removes the option to move away. It is rarely naughtiness and it is not dominance. The fix is patient and practical: manage distance so your dog can stay calm, teach a simple look and look back game at that distance, and close the gap over weeks, not days.
On a lead, a worried dog cannot increase distance from the thing that worries it, so the behaviour gets bigger: bark to make the other dog go away, or lunge toward a dog it desperately wants to greet. Both look dramatic, and both get rehearsed on every walk unless the setup changes. Your dog is not trying to rule the street. It is over threshold, which simply means too close, too stressed and unable to think.
Calm lead skills make this game far easier, so pair it with our guide to loose leash walking.
Teach a happy about turn at home first, where nothing matters. Say your dog's name, turn, and trot the other way, then pay generously when your dog catches up. Practise until the turn is a fun game. On the street it becomes your escape hatch when a dog appears around a corner or a doorway opens too close. A trained exit beats a standoff every time.
Let your dog sniff. Sniffing is decompression: it lowers arousal and gives the brain a job that is not scanning for dogs. A walk with long sniffing stops often teaches more calm than a fast march under constant tension.
Expect weeks to months, not a weekend fix. Progress usually shows first as quieter recoveries: your dog notices, barks once, then can look away and move on. Silence at close range comes later, and some dogs will always need a little more space. That is a good outcome, not a failure.
Do not flood your dog by walking along the dog park fence line, or by holding it close to triggers until it stops reacting. Do not use lead corrections, and do not use shock or prong collars: we do not recommend them, because they add pain to fear and can make reactivity worse. Training that hurts has no place in this plan.
Browse the rest of the series in our training hub.
Sudden onset means a vet pain check first, before any training plan. After that, a certified behaviourist can assess your dog in person and build a plan around your streets and your dog.
Method: reward based protocols as taught by certified trainers (CPDT) and veterinary behaviour services. Distance work only counts while your dog can still think and eat, so widen the gap the moment either one fails.
Last updated: November 2026. Checked against the sources on our methodology page.