Why Does My Dog Bark and Lunge at Other Dogs?

You spot another dog coming. Your stomach drops. You cross the road, pull your dog close, or brace for the explosion: the barking, the lunging, the pulling so hard the lead cuts into your hand.

If this is your daily walk, you're not alone. And your dog is not broken.

Leash reactivity is one of the most common problems dog owners in Trowbridge, Frome, and Bradford on Avon ask about. It's also one of the most misunderstood. Most advice online tells you to carry more treats, move further away, and wait it out.

That advice isn't wrong, but it's incomplete. And if you've already tried it and you're still here reading this, you probably already know that.

Let's explain what's actually happening, why the standard advice only gets you so far, and what it takes to genuinely fix it.

What Leash Reactivity Actually Is

Reactivity is not aggression. It's not dominance. And it's almost never random.

When your dog sees another dog and explodes on the lead, they're in a state of high arousal. Their nervous system has detected something it finds threatening, exciting, or frustrating, and it's responding accordingly.

The lead makes it worse. Off lead, most reactive dogs can run away, do a curved approach, or simply avoid. On the lead, they can't. That trapped feeling turns anxiety or frustration into a full-body response: barking, lunging, spinning, or freezing.

Here's the key thing to understand: your dog isn't choosing to behave badly. They're reacting to a chain of triggers they've been conditioned to respond to, often without either of you realising it was happening.

The Real Cause: Classical Conditioning Chains

Dogs learn associations constantly. Every walk, every encounter, every time you tighten the lead before another dog appears, your dog is learning.

This is classical conditioning. And it's almost certainly responsible for your dog's reactivity.

Here's how it typically develops:

1. Dog sees another dog (neutral stimulus)
2. Dog feels uncertain, excited, or anxious
3. Owner tenses the lead (unintentional signal)
4. Dog barks or lunges
5. Other dog goes away (the reaction "works")
6. The brain files this away: see dog, explode, threat disappears

Over time, the chain extends. It doesn't start at seeing the dog anymore. It starts the moment you clip the lead on. Then it starts when you leave the house. Then it starts when you reach a certain street.

This is why threshold and trigger stacking matter so much. A dog that copes fine on a calm Tuesday morning might fall apart on a Saturday afternoon. Same dog, same route, but they arrived already carrying anxiety from the car journey, the noise on the street, and the other dog they passed 10 minutes earlier. Their threshold was already used up.

By the time the triggering dog appears, they were always going to go off.

Why "Just Use More Treats" Has Its Limits

Positive reinforcement is a powerful tool. It absolutely has a role in reactivity work, and building a positive association with the sight of other dogs is part of what we do.

But here's what treats alone cannot do.

Treats cannot compel behaviour in the moment.

If your dog is already over threshold and barking, they are not in a state to take food. Their brain is flooded with cortisol and adrenaline. The treat pouch is invisible to them. You can't train a dog that has already crossed the line.

And even below threshold, positive reinforcement only influences future probability. It changes what your dog is likely to do next time. It cannot stop a behaviour that's happening right now.

This is why at Wagandwalks, we use a complete training approach, all four quadrants of operant conditioning, not just one. It's why the dogs we work with don't just learn to tolerate other dogs from a distance. They learn a genuinely different response, and why that response sticks under real-world pressure.

What Actually Changes a Reactive Dog

Real progress with a reactive dog requires three things working together.

1. Lowering the overall arousal baseline

Before you can work on the specific trigger (other dogs), your dog needs to be in a calm enough state to learn. This means addressing everything that feeds their general anxiety: the daily walk routine, the energy level in the home, the way they carry themselves through the world.

The Box exercise we use with reactive dogs is one of the most effective tools for this. It teaches a dog to find stillness and calm on cue, a mental rest state they can return to even in stimulating environments. Think of it as building a mental muscle. The more they practise it, the stronger and more accessible it becomes.

2. Breaking the conditioned association

Your dog has learned that another dog equals explosions. That's a classical conditioning chain, and the only way to change it is to consistently pair the trigger with a different outcome.

This isn't about flooding (forcing your dog into the situation until they give up). It's about careful, structured exposure below threshold, where your dog is in a state to learn, and where the outcome is different to what they've come to expect.

3. Teaching a genuine alternative behaviour

"Look at me" only gets you so far. What we're looking for is a dog that has a trained behaviour they default to when they see another dog, and that behaviour is incompatible with barking and lunging.

This is where negative reinforcement becomes part of the picture. A behaviour built partly through pressure-and-release is significantly more persistent than one built through food alone. It's more resistant to extinction under stress. In other words, it holds up when you need it to: on a busy Saturday pavement, not just in a quiet training paddock.

What This Looks Like in Practice

At Wagandwalks, we don't take a one-size-fits-all approach to reactivity. Every dog is different: different drives, different history, different triggers, different threshold.

What we do for every dog is build motivation first. A dog that genuinely wants to work with you is a dog you can train. From there, we layer in the specific work: calming foundations, classical counter-conditioning, trained alternative behaviours, and real-world exposure, gradually, strategically, and always at the pace of the dog.

The result isn't a dog that merely copes with other dogs. It's a dog you can actually walk.

When to Get Help

Reactivity doesn't typically improve on its own. Without intervention, the chain gets longer, the threshold gets lower, and the behaviour becomes more ingrained.

If your dog:

• Barks, lunges, or fixates on other dogs on the lead
• Is making you cross the road or avoid walks altogether
• Is getting worse over time, not better
• Has already failed a group class or generic training programme

...then you need a 1-to-1 approach from someone who understands what's actually happening.

We offer a free WhatsApp assessment for reactive dogs in Trowbridge, Frome, and Bradford on Avon. Tell us a bit about your dog, when it started, and what you've already tried, and we'll give you an honest picture of what's possible.

No sales pitch. No commitment. Just a real answer.

Frequently Asked Questions

Is my reactive dog dangerous?

Reactivity and aggression are different things. Most reactive dogs are frustrated or anxious, not predatory. That said, any dog showing behavioural issues should be assessed individually. Don't rely on a blanket answer.

Can any dog be fixed?

In our experience, with the right approach, most dogs can make significant, lasting progress. "Fixed" isn't always the right frame. The goal is a dog that behaves safely and predictably on a walk, and an owner who enjoys walking them.

My dog is fine off lead. Why is it only on the lead?

Classic leash reactivity. The lead removes the dog's ability to create distance or approach naturally. Over time, the lead itself becomes part of the trigger chain. This is very common and very workable.

How long does it take?

It depends on the dog, the history, and how consistently the work is practised. Most dogs in our reactivity programme show meaningful change within the first few sessions. Lasting change requires commitment between sessions, and we support you throughout via WhatsApp.

Ready to Stop Dreading Walks?

If you're in Trowbridge, Frome, or Bradford on Avon and your dog is reactive on the lead, we'd love to help.

Message us on WhatsApp for a free assessment. No obligation, just a conversation about your dog and what's possible.

Wagandwalks offers 1-to-1 dog training and walking in Trowbridge, Frome, and Bradford on Avon. Level 4 qualified. 98% success rate. 5.0 stars from 68 Google reviews.