Heavy Dog is the boss of The Doom in Shadow the Hedgehog (game). A circular GUN hovertank, the Heavy Dog is armed with an area-of-effect particle weapon, six circumferential homing rocket launchers, and floating aerial mines. This formidable weapon was deployed 50 years ago by GUN in their attack on the Space Colony ARK to shut down Project Shadow, and in his Black Doom-induced flashback, Shadow relives his original fight with the machine. It is very similar to another GUN boss in Shadow the Hedgehog, the Blue Falcon.