Bulldog

Bulldog is Detection/Alarm program is software upgrade of the Watchdog alarm, Bulldog (aka,v.ll) was designed with higher-powered probe systems than its foreunner. Like the normal Watchdog, Bulldog alerts its owners to illegal entries in the system. This program can be fooled with Invisibility Replicator, and can be eliminated with Killer.

Source

 * Chromebook Volume 1, pg. 91