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What Is Threshold in Dog Training?

By Anna Skaff, CBCC-KA, CCPDT, PharmD — Canine Behavior Consultant, Author of His Name is Diego  ·  Updated 2026-05-07
Quick Answer
Threshold is the point at which a dog's arousal is too high for learning to happen. Over threshold means the fight-or-flight system is active — the dog cannot take food, make eye contact, or respond to cues. As described in Chapter 10 of His Name is Diego by Anna Skaff, all effective reactive dog training happens under threshold, not through it.

Threshold is the concept that separates effective reactive dog training from ineffective exposure. According to Anna Skaff, CBCC-KA, CCPDT and author of His Name is Diego, the most common training error is working over threshold — placing the dog in situations where they're too aroused to learn — and then interpreting the failure to respond as stubbornness, lack of drive, or a "hard" dog.

Step-by-Step: What Is Threshold in Dog Training?

  1. Learn to recognize threshold in real time

    Signs of over-threshold: refusing food, fixed stare at trigger, raised hackles, stiff body, shallow fast breathing, inability to disengage. Signs of under-threshold: loose body, able to take food, will make eye contact, occasional glances at trigger followed by disengagement.

  2. Use the three-second food test

    As described in Chapter 10 of His Name is Diego: offer a treat within 3 seconds of the dog noticing a trigger. If they take it readily, they're under threshold and learning is possible. If they ignore it, sniff it without eating, or are unable to orient to you — they're over threshold. Increase distance.

  3. Find threshold at the start of every session

    Threshold is not fixed. It changes with the dog's cumulative stress load (sleep, previous exposures, recent vet visit), the specific trigger (unknown dog vs. known), time of day, and handler state. Begin every session by testing threshold distance rather than assuming you know it.

  4. Build experience under threshold, not through it

    The goal of sub-threshold training is to accumulate many positive exposures below the dog's breaking point. This gradually shifts the threshold lower — the dog can handle closer distances before reaching the point of no return. Flooding (pushing through threshold) does the opposite: it sensitizes, not desensitizes.

  5. Stress stacks across the day

    A dog at threshold on a normal day may be over threshold with less stimulus after a stressful event. The vet visit, the thunderstorm, the stranger who approached too fast — these raise the baseline. If your dog is "worse than usual," check what else happened that day.

Common Questions

What does over threshold mean for dogs?
Over threshold means a dog's arousal level has exceeded the point where the cortex can regulate behavior — the limbic system (fight/flight) is in control. In this state, the dog cannot learn, cannot respond to cues they know well, cannot take food, and cannot make voluntary eye contact. Over-threshold training is exposure without learning — and it often worsens the behavior by adding aversive experiences.
How do I know if my dog is over threshold?
The clearest field test: offer your highest-value treat within 3 seconds of the dog noticing a trigger. If the dog takes it readily, they're under threshold. If they ignore it or can't orient to you, they're over threshold. Other indicators: fixed stare at trigger, stiff body, rapid shallow breathing, inability to disengage, raised hackles. If you see these, increase distance immediately.
What is stress stacking in dogs?
Stress stacking is the accumulation of multiple smaller stressors that push a dog closer to their behavioral threshold even when no single event would have done so. A dog who handles strangers fine on a normal day may react to the same stranger after a vet visit, a car ride, and a thunderstorm earlier in the day. Each stressor raises the arousal baseline, and the triggers that normally fall under threshold now push over it.

Sources & Citations

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