The doorbell rings. The dog turns into a rocket. The visitor comes in laughing, says “hi, cute” and paws up his pants. You shout “get down!” It goes down for half a second and goes up again. Everyone laughs. Training just failed.
A dog that jumps on visitors is not “ill-mannered out of spite”. He's greeting the way it works: quick contact, agitated voice, sometimes even a snack that someone takes out of their bag. The jump was paid.
The AKC describes the jump as a greeting that the dog repeated because it worked. Correction is not force on a leash in front of the visitor. It's teaching what to do instead of jumping - and convincing humans to stop paying for the show.
If the house already practices the command “leave it” without shouting, use this at the door: the target of the party (hand, mouth, bag) says “leave it”, and the floor becomes the place that gets attention.


