Proofing
Practising a behaviour across enough places, distractions and people that it stops being a kitchen trick.
Also called: generalisation · he only does it at home · distraction training
Dogs generalise badly. A dog with a perfect sit in your living room genuinely may not have a sit on a wet pavement with a bike going past, and that is not stubbornness — as far as it is concerned, this is a new problem in a new place.
So a behaviour gets rebuilt deliberately in the hard places: at the lift, in the corridor, at the gate at 7pm with the neighbour's dog barking. Change one thing at a time — distance, or duration, or distraction — never all three at once.
This stage is where most home training quietly stops, which is why so many dogs are described as knowing the command and ignoring it.