Understanding Leash Reactivity Through the Nervous System
This may be an unpopular perspective, but when I look at leash reactivity, I don’t see a “bad” dog—I see a nervous system under pressure.
When your dog reacts on leash, something in the environment has activated their sympathetic nervous system—their “go” state. This could be:
- Excitement (wanting to chase a squirrel or play with another dog)
- Social drive (wanting to greet)
- Fear or uncertainty (feeling unsafe around a dog or person)
In all cases, the body is preparing for action.
The Problem: Energy Without Movement
Off leash, your dog would naturally:
- Move toward or away
- Chase
- Play
- Create distance
But on leash, that movement is restricted.
This creates pressure in the nervous system—a kind of energetic bottleneck. The dog cannot complete the action their body is preparing for. Over time, that trapped energy builds and often explodes outward as:
- Barking
- Lunging
- Spinning
- Pulling
It’s not disobedience—it’s unresolved activation.
Fight, Flight… or Forced Fight
If your dog is excited or in “drive,” the leash blocks their ability to chase or engage. This creates frustration.
If your dog is afraid, the leash prevents them from fleeing—so they may default to fight.
This is why some dogs seem “fine” off leash but reactive when restrained.
The leash doesn’t create the emotion—it amplifies it by removing options.
Why “Sit and Watch Me” Can Backfire
A common strategy is to ask the dog to:
- Sit
- Stay still
- Make eye contact
But from a nervous system perspective, this can actually make things worse.
Why?
Because you’re asking the dog to override their biology.
When the body is saying, “Move!”, forcing stillness can push the dog into a freeze response—a shutdown state where the dog is no longer processing in a healthy, adaptive way.
Freeze is not calm—it’s a last-resort survival state.
On top of that, sustained eye contact can feel intense or even threatening to a dog, especially in a heightened state. Instead of feeling supported, the dog may feel more pressure and conflict.
A Better Approach: Let the Energy Move
If the nervous system is activated, the goal is not suppression—it’s expression and resolution.
Instead of stopping the energy, channel it:
- Ask for barking on cue
- Move together—jog, change direction, stay dynamic
- Engage in play (tug, bite work, “maw and mirror”)
- Use resistance feeding or physical engagement
- Offer a toy to bite and carry
These activities:
- Give the energy somewhere to go
- Bring the dog into connection with you
- Help complete the activation cycle
- Support regulation instead of suppression
Becoming a Regulating Presence
When you meet your dog in their state—and give them an outlet—you become part of the solution.
You’re no longer blocking their experience—you’re helping them move through it.
In a sense, you become a grounding point for that energy. The dog begins to associate you with relief, completion, and safety.
Follow the Body, Build the Relationship
When your dog’s body says, “I need to move,” and you respond with “I’ve got you—let’s move together,” you create alignment.
That’s where trust is built.
If your dog offers eye contact naturally, that’s different—they’re seeking connection and co-regulation. In that moment, you can engage, play, and guide.
But don’t force stillness where movement is needed.
Final Thoughts
Leash reactivity isn’t about stubbornness—it’s about a nervous system that can’t complete its response.
When you stop trying to control the behavior and start supporting the underlying state, everything begins to change.
Let your dog move.
Channel the energy.
Become the place where it resolves.