Glossary

Threshold

The point at which a dog goes from noticing something to reacting to it, often described as a distance or an intensity.

Also called: reactive threshold, under threshold, over threshold, trigger distance

In training, a threshold is the line between a dog that can cope and a dog that cannot. Under the threshold, the dog notices a trigger, such as another dog, but can still eat a treat, hear its name and think. Over the threshold, it barks, lunges, freezes or bolts and cannot learn.

Thresholds are not fixed. They shift with distance, the size or speed of the trigger, how tired or stressed the dog is, and what has already happened that day. A dog that handles another dog at 30 feet one day may react at 60 feet the next.

Effective behavior work happens under the threshold. Pushing a dog past it only practices the unwanted behavior. If a dog is over threshold, calmly increase the distance.

Last reviewed November 8, 2026

In the index now

Related terms

Reactivity A dog's exaggerated reaction, such as barking, lunging or freezing, to a trigger like other dogs, people or noises. Trigger stacking Several stressful events building up in a short time so that a dog that would normally cope reacts strongly to a small extra trigger. Desensitization and counter-conditioning A training plan that exposes a dog to a fear trigger at a level it can handle while pairing it with something good, to change how the dog feels. Leash reactivity Barking, lunging or growling at other dogs or people when on a leash, often from fear or frustration at being unable to move freely.