Once a woof is made, it is set in stone. Depends on the nature of the woof. A woof regarding a specific contest will only affect the outcome of that contest. Although little is known about this, the woofing Gods sometimes, in response to a particularly vicious woof or anti-woof, allow a team to win enough to make it to the playoffs, only to smite them there. Much research needs to be done in this area.
Some woofs are inherently ambiguous.
In cases where the intent cannot be determined, the woof will be ignored. Yes, there is. Keep your trap shut. Or if you are going to say something, make it intelligent and analytical. On second thought, scratch that.