Is the arduino's watchdog timer already on?

As the title says, it's auto-on or it must be enabled and then setted (ms period)?

(I'm talking about Arduino 1 rev3)

Thanks in advance :wink:

The watchdog is off by default (imagine the chaos if it were enabled!)

AWOL:
The watchdog is off by default (imagine the chaos if it were enabled!)

Thanks! Yes lol only who can manage it should use it.