The removal of a Cookie to decrease the likelihood of a behavior happening in the future.
Punishment inhibits behavior, it stops it from happening or reduces the likelihood of it happening in the future. The “negative” part of Negative Punishment means you take something of value away to inhibit behavior.
In disc dog freestyle Negative Punishment is a removal of the opportunity to get a disc or to do more work. Taking away the game or taking away Next for a moment or two is Negative Punishment.
Negative Punishment punishes by taking something away.