Testing and strengthening a trained behaviour under increasingly difficult conditions — duration, distance, and distraction.
Proofing is the process of testing and strengthening a trained behaviour under increasingly difficult conditions, such as distractions, distance from the handler, or longer duration. The aim is a behaviour that holds up in real situations, not just in a quiet training room.
It's closely related to generalisation, but where generalisation is about performing a behaviour in different places, proofing is more specifically about performing it despite added difficulty or distraction.
Trainers often describe proofing using three factors, sometimes called the three Ds: duration, distance, and distraction. Each one is increased gradually and separately. A dog might first be proofed for a longer stay, then a stay further from the handler, then a stay with mild distractions nearby, only combining several factors at once once each has been solid individually.
Rushing to combine all three factors too soon, for example asking for a long stay, far away, with high distractions all at once, is one of the most common reasons a previously reliable behaviour suddenly falls apart.
Increasing difficulty too quickly, or across more than one factor at once, is the main cause of proofing setbacks. It usually helps to only increase one variable at a time.
Duration, distance, and distraction. These are the three factors most commonly increased, one at a time, when proofing a behaviour.
When it holds up reliably across a wide range of real world situations, not just in the environment it was originally trained in. This usually takes deliberate, gradual practice across many sessions.
This is often a proofing issue rather than a sign the dog forgot the behaviour. Real environments add distance, distraction, and unfamiliarity all at once, which a behaviour needs to be specifically built up to handle.
