When working with dogs, especially those struggling with fear, reactivity, or anxiety understanding thresholds is one of the most important concepts in behaviour modification. As a trainer who uses positive reinforcement and force-free methods, I place great emphasis on helping owners recognise when their dogs are under, at, or over threshold. This awareness not only protects the dog’s emotional wellbeing but also sets the foundation for true learning and trust.
What are thresholds?
A threshold is your dog’s emotional tipping point , the line between being comfortable and becoming overwhelmed.
- Under threshold:
Your dog is aware of the trigger (such as another dog, person, sound, or situation) but remains calm and responsive. Their body is relaxed, they may still take treats, respond to cues, and explore their environment.
This is the ideal learning zone. - At threshold:
Your dog starts to show signs of tension, stiff body, alert ears, focused stare, or hesitation. They may still respond to you, but their attention is divided. It’s a signal that the trigger is close to becoming too much. - Over threshold:
Your dog is now in a state of emotional overload, barking, lunging, freezing, cowering, or trying to flee. At this point, the thinking part of the brain shuts down, and learning stops. The dog is operating purely on instinct (fight, flight, or freeze).
Understanding these levels allows you to work below threshold, where your dog can observe, learn, and make positive associations without feeling unsafe.
Why threshold awareness matters
Training and behaviour modification are most effective under threshold. This is where the dog’s brain is calm enough to process information and link rewards to behaviour.
When we push a dog too close to their trigger , or expose them too soon the dog crosses that invisible line and enters a state of stress or panic. Once a dog is over threshold, no amount of treats, commands, or soothing words will help; they are simply too overwhelmed to learn.
Working under threshold allows us to:
1.Build trust and confidence.
2.Prevent rehearsal of reactive behaviours.
3.Create new emotional responses through desensitisation and counterconditioning.
4.Keep training sessions positive, safe, and productive.
What is “Flooding” and why it’s ill-advised
Flooding is an outdated technique that involves exposing a dog to a feared trigger at full intensity and not allowing escape, with the idea that they will “get used to it.”
For example, forcing a dog that’s terrified of cars to sit beside a busy road until they “calm down,” or making a dog fearful of other dogs stay in a crowded park.
While flooding may appear to “work” temporarily, it often causes the opposite effect , increased fear, mistrust, and even aggression. The dog doesn’t learn that the trigger is safe; they simply shut down or become more reactive in future encounters.
Flooding violates the principles of humane, science-based training because it ignores the dog’s emotional state. True progress comes from gradual exposure while maintaining a sense of safety and control.
How we use thresholds in Behaviour Modification
When I work with dogs showing reactivity, anxiety, or fear-based behaviours, the first step is always to identify the dog’s threshold distance how close they can be to a trigger before stress appears.
From there, we design a plan that includes:
- Gradual exposure below threshold.
- Positive reinforcement for calm, alternative behaviours.
- Clear communication and consistent cues.
- Management strategies to prevent overwhelming experiences.
The goal is not to suppress behaviour, but to change the dog’s emotional response , helping them feel safe, confident, and understood.
Understanding thresholds is about respecting your dog’s emotional limits and setting them up for success. When you learn to recognise your dog’s comfort zone and work within it, you build trust and trust is the foundation of every successful training journey.
Behaviour change takes time, patience, and empathy. By keeping your dog under threshold and avoiding harsh or overwhelming techniques like flooding, you not only create lasting progress but also nurture a happier, more confident companion.
