This weapon is actually an odd form of cyberdog, except instead of a robotic body in the image of a canine companion, a living dog's brain has been provided with a machine gun frame, utilizing .357 Magnum ammunition. Its "canine" features include two metallic "ears" mounted on top of the weapon that move like a real dog's and a sniffer mounted on the jar containing its preserved brain, allowing the gun to sense its surroundings. The metal ears also appear to move up and down faster if the gun is pointing in the direction of an enemy.
It will growl when the player has it equipped and comes into contact with enemies, whine mournfully when unequipped and bark when equipped. It also has, atypically for a machine gun, a telescopic sight (x2.43 magnification) which gives a relatively accurate aiming point and excellent precision in firing for a chain gun type weapon. When fired, the barrels reciprocate, rather than spinning like those of the minigun.
The K9000 can also detect enemies out of visual and Perception range. When the weapon and its sniffer hover in the direction of an enemy for a few seconds, it will let out a detection growl, even at extreme range or when the enemy is hidden from appearing on radar.
Big MT - During the first conversation, the player character receives it from the think tanks after passing a Guns check of 50. However, if the player's Energy Weapons skill is higher than their Guns skill, they will get a second Sonic Emitter instead.
PCPlaystation 3Xbox 360 When using a Stealth Boy with the K-9000 cyberdog gun equipped, the brain case turns yellow. [verified]
PCPlaystation 3Xbox 360 There is a bug in the V.A.T.S. animation whereby it shows the weapon ejecting 12 spent cartridge cases instead of the correct number of 3. A close inspection of the damage dealt during one V.A.T.S. round will show that the weapon will deal the correct damage of 3 rounds and 3 rounds will be properly deducted from your inventory. [verified]
PCXbox 360 There is a bug that sometimes occurs after wearing it, the ammo pack will be stuck on your back. This can be fixed by restarting the game. [verified]