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Second, he doesn't like hats, or the people wearing them. Don't ask, I don't know. Maybe because it rhymes with rats.
”— The King on Rex
The Mk. III Cyberhound, LEO Support Model, Serial no. B955883, known to the people of Freeside as Rex, is a cyberdog in 2281 under the ownership of the King. He is suffering from neural degeneration as a result of his old brain.
Part German Shepherd, Rex is a "cyberhound Mk III law enforcement officer support model" that has been around since pre-War times. He was born as a regular dog in 2072 and served in the Denver City Police Department. Sometime before the war, he was cybernetically enhanced and turned into a cyberdog - serial no. B955883, although the circumstances of his cybernetic alterations remain unknown. He survived the destruction of Denver and the harsh wastelands, eventually becoming Caesar's companion for a time, but was lost in battle. He later reached Freeside, where he came under the ownership of the King, who loves him dearly. Rex does not like rats, or hats, according to the King. The King says his dislike of hats may come from the fact that hat rhymes with rat.
 Interactions with the player character
 Interactions overview
 Other interactions
- Should the player have a hat equipped when first talking to Rex, he will start barking at the player because of his hatred for hats, but ease Rex by telling him they're both on the same side.
- If player has Rex as a companion and goes to recruit Arcade Gannon, Arcade will say "A courier, a doctor, and a cybernetic dog. Maybe when this is over we can open an act at The Tops".
- If the player has the Wild Wasteland trait, Rex will say "aroo" to the courier at a random time. The Courier can then ask if Jimmy has fallen down a well (this is random and does not always happen). This adds the location Jimmy's well to your map. Down in the well you will be confronted by a mole rat, and there will be a skeleton. Next to him is the Abilene Kid LE BB gun, 2 tins of BB's, a super stimpak and a rawhide cowboy hat. This is a reference to the television series Lassie, as well as to the quest with Laddie in Fallout 2.
- Nightkin: Head voices speak of doggy with squishy brain.
- NCR civilians: What on earth is *that* creature?
- Gun Runners: I've never a dog like that. Who thinks up these things?
- Boomers: That thing is housebroken, right?
- Legion: The dog is part-machine... but its brain is flesh.
- Brotherhood of Steel: What a fascinating animal. I'm sure the scribes will want to take a look at him.
- Brotherhood Scribe: Is that a Mk. III Support Model you have with you? I've seen references to them, but never with my own eyes. I imagine he makes a great pet.
- Powder Gangers: Didn't know they still had robo-dogs around.
- Great Khans: A robot dog? Never seen one of those before.
- Followers: Look at that - a cyber-dog. There can't be many of those left.
- Freesiders: Good to see Rex still around and kicking.
- The Kings: Hey, isn't that the King's dog?; Heya Rex, how you doing boy?
- Strip Securitrons: Be advised, visitors will be held responsible for the behavior of any robots accompanying them.
- Omertas: I think there is something wrong with that dog.
- Outer Vegas denizens: What the hell? Is that a half-robot dog?
|| Voice-over narration
|| In-game condition
|| He had survived police service in Colorado, the Great War, combat duty with the Legion, and being the companion of The King. But, in the end, Rex finally succumbed to the horrors of the wasteland.
|| Rex dies.
|| Having never received a replacement brain, Rex finally succumbed to old age, abruptly shutting down forever one quiet morning. After two centuries of life and decades of service to humanity, Rex collapses and dies.
|| Do not complete Rex's personal quest, Nothin' But a Hound Dog.
|| Revitalized by Violetta's brain, Rex eventually learned to balance the memories of his old life with Violetta's experiences among the brutal Fiends. His mind had difficulty adjusting, but Rex eventually found peace with his new, more vicious self.
|| Complete Rex's personal quest, Nothin' But a Hound Dog, by implanting Violetta's Brain in Rex.
|| With the transplant of Lupa's brain, Rex gained all of the donor's experiences traveling with the Legion. These melded well with his own memories of the Legion, and his new mind quickly adjusted to the myriad memories.
|| Complete Rex's personal quest, Nothin' But a Hound Dog, by implanting Lupa's brain in Rex.
|| After Rey's brain was transplanted into Rex's cybernetic body, it took Rex some time to adjust to the old scrapyard dog's memories. Eventually, Rex's mind settled peacefully, melding his own memories with that of long travels with Old Lady Gibson.
|| Complete Rex's personal quest, Nothin' But a Hound Dog, by implanting Rey's brain in Rex.
If Old World Blues is installed, and Roxie has been created, it triggers set of endings which add a bit more to Rex's story.
|| Voice-over narration
|| In-game condition
|| There, she ran across Rex at the Kings School of Impersonation. His brain was failing. That was all right, he was still smarter than the Think Tank. The two of them constructed a litter of cyberpups, a small army of Boston terrifiers that gnawed and devoured anything in their path.
|| Rex is alive, but not obtained as a companion
|| There, she ran across Rex, who had been following the Courier, just as she had. They barked for a while, and realized they had a lot in common. The two of them constructed a litter of cyberpups, a small army of Boston terrifiers that gnawed and devoured anything in their path.
|| Rex is alive and a companion on standby
|| There, she ran across the corpse of Rex. She dragged him back to the Big Empty and had him rebuilt for company. The two of them constructed a litter of cyberpups, a small army of Boston terrifiers that gnawed and devoured anything in their path.
|| Rex is dead
- Because his "Bite" weapon engagement radius is set to that of a ranged weapon and Rex has a high PER stat, he will often charge towards enemies from long distances, even if set to a Passive behavior through the Companion Wheel.
- If Rex dies, the King will have a few solemn words about his passing.
- Like all cyberdogs, Rex is not affected by pulse weapons.
- It appears that Rex will not attack giant rats or mole rats if the Courier has the Animal Friend perk. Likewise, despite his apparent hatred for rats, he won't attack Snuffles at Sloan or the occasional non-hostile giant rat running around Freeside.
- Rex has a unique special attack where he actually tackles enemies to the ground.
- Rex will growl uncontrollably as if enemies are nearby if you take him into the Silver Rush.
- Despite Rex's hatred for hats he only reacts with scarce growls towards the Courier if they have any form of headwear equipped.
- Even though Rex is a cyberdog, non-player characters still talk to him as if Rex is a normal humanoid.
Rex appears only in Fallout: New Vegas.
 Behind the scenes
- Nothin' But a Hound Dog, it is possible to stealthily kill Lupa and loot Lupa's brain from her corpse. If she is successfully killed without the player being noticed, Antony may not "notice" that Lupa has died and will still give you the option to fight her in the arena for her brain. If the player accepts, it is possible to obtain a second Lupa's Brain. DO NOT DO THIS. Having 2 of the brains in your inventory will cause Dr. Henry to not recognize that you have the brain at all, making it impossible to give Rex Lupa's brain. To solve this, either revert to an earlier save, or enter "player.removeitem 0013d851 1" in the console, without the quotes. Make sure that you only have one instance of Lupa's brain.
In the course of the quest
- After returning from The Big MT, when trying to talk to Rex, he will bark and will not be able to enter dialogue. To fix this, Crouch and try to talk to/pickpocket Rex and you should enter dialogue.
- Lucky 38 presidential suite, sometimes he will not be there. If this happens, go to the King's School of Impersonation in Freeside where he can possibly be found in the hallways there at which point he runs back to the Lucky 38 instead of fast traveling there.
When Rex is acquired, and if you tell him to wait in the
- Sometimes simply entering and exiting the King's School of Impersonation will cause Rex to appear and run to the Lucky 38 when you exit.
- Sometimes, Rex will disappear from the game if you send him to the Lucky 38. Remarks about him will still come from non-player character's and his perk will still be with you, however; you won't be able to fire him meaning you will only have one human follower and will not be able to have ED-E tag along with you (This is because ED-E is a robot and you can only have one human and one non-human following you at the same time). UPDATE: Can now be fixed via the Companion dismissal terminal. Also, in the PC version, you can go to Rex by using the console command "player.moveto 0010d8df" without quotation marks
- Remnants bunker
Rex may die randomly while in the
- Remnants bunker. Fast travel to some other place if you see his health drop.
Rex loses health when near the
- Nothin' but a Hound Dog, when he is theoretically on loan to you and not a permanent companion, he may disappear and not return to The King. He may eventually show up after traveling to Doc Henry and speaking to him about Rex. Don't travel from The King to Henry and back, Rex still won't be there. When you realize he's gone, load the last saved game, go to Jacobstown and then visit The King.
If you dismiss Rex during
- During combat, Rex might chaotically run around from-and-to foes while not attacking anyone. He may also in fact not attack at all when you have him.
- Rex will sometimes stop moving as if he has been told to wait. You will need to keep checking to see if he is still with you. This can usually be fixed by telling him to wait, then tell him follow you again, fast traveling or going through a door that requires a transition. However these fixes are per incident and he will randomly do it again.
- You Can Depend on Me (or just trying to sneak into the Gun Runners), Rex may glitch while in combat with the guards and end up in the Vendortron's kiosk. There is no physical way into the kiosk and Rex can still be spoken to. The only way to fix this problem is to fast travel to another location, in which Rex will appear beside you in patched versions of the game.
While doing the quest
- Calamity, the epilogue may state that Rex never got a replacement brain even though the quest is completed, rather than the correct ending.
While vilified by the Legion, if Rex simply kills Lupa while you are disguised and have her brain transplanted by
- Dead Money when you escape, you might not be able to find Rex anywhere. He might be found in the lobby of The King's School of Impersonation.
When you are knocked out in
- If Rex and another person (i.e. the player or another companion) attack the same enemy at the same time and the game goes into slow motion kill-cam, the game may freeze. Turning kill-cam off may solve this problem.
- Rex may occasionally start unprovoked attacks, even with Passive mode on. Telling Rex to wait a distance from the person can fix this.
- Caesar in the quest Render Unto Caesar and you confirm that you want to battle Benny, the game will automatically send you to the ring, and when you win, Rex will be nowhere to be found. He isn't with The King or at any casinos. If you were already at the point in Nothin' But a Hound Dog where you are looking for a new brain, you can still gain a brain as the AI will think you still have Rex, but when you go back to Doctor Henry, he will say he can't perform the surgery without Rex. To fix this in the PC version open the console and type player.moveto 10d8df - Rex is located next to the arena along the outer fence.
If you tell Rex to wait outside when visiting
- The King in his room, very top floor of The King's School of Impersonation, he will sometimes drop through the floor and wind up at the bottom level. Just wait a few minutes and you will find him running towards you.
When acquiring Rex from
- If you enter and exit Gomorrah while Rex is following with you and has weapons in his inventory, the weapons may disappear completely even after leaving the casino.
- For some reason Rex may just randomly die, even outside of hardcore mode.
- While in combat with an enemy, shooting Rex may cause the game to freeze.
- Initiating conversation with rex, while in the water, may cause a the game to freeze/crash.
- While Rex is a companion, the game sometimes freezes when he attacks an enemy.
 See also
- ↑ http://www.gamasutra.com/blogs/WillOoi/20110918/8462/An_Interview_with_Chris_Avellone__game_designer_writer_and_former_unlucky_schlep__Part_3.php