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Rex is a permanent companion that can gain a benefit after completing his quest from The King "Aint Nothin But A Hound Dog" you do not need to kill The King in order to recruit Rex. He is also a part of the Achievements "The Whole Gang's Here" and "Ol' Buddy Ol' Pal"
this is WRONG. i did not kill the king, i did the quest and i got him. so u r wrong. and dont worry bout losing him once u heal him (go to the gibson scrap yard and kill the dogs and take reys, i think, brain) once u have the brain u can heal rex and u still keep him. ^^^^^^^^^^^ hey, idiot. This post is really unorganized and full of t he sort of spelling errors you expect to see in a 15 year old's text messages.
Where is it said that he doesn't like hats? --Kris 13:29, September 15, 2010 (UTC)
On his card. Tezzla Cannon 13:34, September 15, 2010 (UTC)
His card? what? where?
--Kris 23:26, September 17, 2010 (UTC)
OOOOOOh ok! I've been trying to figure out why people were saying that for a while.
The King mentions 'in game' that Rex dislikes Rats and Hats, and people wearing Hats. That is the best reason people are mentioning this.
He really does hate hats, I've had him tagging along for a bit now and he looks like he's about to jump any npc with a hat on after growling and barking at them. I keep waiting for him to actually maul someone, hasn't yet sadly -.- Since there's no cats to be found in the Mojave, its probably a safe assumption that he'd go after them as well if he could find ant...Cat, rat...hat...they all rhyme and that seems to be most of the basis for his dislike.
---I had problems with Rex attacking the Legion commander in Cottonwood. Some dialogue with him mentioned the courier inquiring how to get his hat, so I assume that's why Rex attacked.
- I have noticed that when I tell him to wait as I decorate my Wolfhorn Ranch house and he growls at me because I wear a bandana!! GamerAddict7796 09:08, May 2, 2011 (UTC)
 Article name
I changed the article name to what it says his full name is here: 
I was thinking simply along the lines of article names being full names of everything with a name, but if someone thinks it should just be "Rex", feel free to change it back. (I know I don't have to give permission, but I also know not everyone will like how the name is right now)
-- Juicestain09 19:52, September 15, 2010 (UTC)
Short name seems much better and practical. It's just not good to even write the serial number into it. If at all, "Cyber-Hound Mk. III" would be correct. Still, "Rex" is much more fitting. --Mr.Lexx(talk) 19:54, September 15, 2010 (UTC)
My opinion is we have the name as his full name, but we could make some redirects with parts of the name to make is easier to find him, no? --Juicestain09 20:05, September 15, 2010 (UTC)
I'm changing it back because the full name can always go in his info box. Shadowrunner56 20:07, September 15, 2010 (UTC)
How does everyone like the first paragraph and the infobox title? --Juicestain09 20:14, September 15, 2010 (UTC)
 Lupa's Brain Bug?
(Hardcore mode/360) After replacing Rex's brain I noticed that his health started displaying as 100/0, and he ended up dying frequently. I was stubborn and kept reloading until he died fighting a single spore plant at level 20. Anyone else experience this bug?
I am currently also experiencing this bug. Pretty much everything I fight 1 or 2 shots him. I have no idea how to fix this.
Same here. Also, whenever he gets hit, it's (HP)/0. you can't heal him this way
 Where does Rex respawn?
Went into the Strip and lost both Rex and Boone. Does anyone know where Rex reappears if lost? When I try to get another follower, it still tells me I have too many. Help!
I believe he re-spawns at The King's. He should be in the lobby. I found him there.
Give it some time, and a message will eventually pop up saying he's gone back to Freeside (after being in "phantom" companion mode keeping you from recruiting others and causing the dialogue regarding him still being with you when he's not). Unfortunately, I've checked King's several times, and Rex hasn't shown up yet, even after sleeping in and outside the area. Same thing happened to Arcade Gannon.
Can't find Rex either. One moment he was behind me in Gomorrah, when I turned back, he was no longer there and I couldn't find him. Is there any official walktrough or hints or something from Betashade? EDIT: So, I'm roaming the vault 34 and out of nowhere, Rex appears. Almost shot him.
Something similar happened to me i told him stay at Lucky 38 next time i came to check on him he was gone.Lost both him and Lily this way... and a bunch of good equipment
I told ED-E to go home and went to get Rex at Lucky 38 where I saw him last, but when I get there the only person that's there is Veronica. Rex appears to be completely gone.
Lost Rex, looked at King's and Lucky with no luck' I've also tried the Vault (22?) elevator trick but to no success. The I suppose "minor/lesser" companion slot is open (I can get ED-E to tag along at any time) so it's not like he's waiting somewhere. Some more insight would be nice.
After dismissing Boone (so that he wouldn't annihilate the Legionaries), I fought Lupa at the Fort while Rex was with me, and after I defeated her, he was gone from the camp. NPCs still comment about him all the time. I waited a few days, nothing. Went back to Freeside and searched up and down, no dice. So now I can't recruit any other non-human companions, and I can't heal him. Any special tricks to get him back?
I asked rex to wait for me inside Lucky 38. He was there at first.. but after awhile he disapperd. This most be a bug! :(
uh well ive had rex for a while and ive completed his quest but as ive been playing there has been a couple of moments where he should have died but instead he just becomes unconscious and wakes up a minute later fine with full health...has anyone else expierenced this?
herpdeuhhhrhhrrp thats what happens when you don't play on hardcore
it might be worth it to make a note somewhere in the article that Rex means king in latin and that it is The King that owns Rex. i put that in a triva section but someone quickly removed it (should i have not added it?)--Ohno21212 15:08, October 30, 2010 (UTC)
- Rex does mean king, but it is also the stereotypical dog name in various media, so I don't think a note on the latin origin is especially noteworthy. I removed the trivia for two reasons: we don't have a trivia section - it's either behind the scenes or it's a note - and the comment about the fittingness of the name is a subjective judgement, so not relevant to the article. No big deal to me, though, if the latin meaning is noted without commentary.--Gothemasticator 15:22, October 30, 2010 (UTC)
- Here's a theory. Perhaps the "King in Latin" thing was Ceasar's idea. There's a good 150 year gap (when did he come from Denver to Nevada? When did Caesar become his sidekick?) in Rex's timeline as it is, and Caesar might've coined his 'new', Latin name upon discovering Rex. The way I see it, Rex's name is a double wammy of multiple meanings. --126.96.36.199 07:05, November 29, 2010 (UTC)
Ah ok that makes sense --Ohno21212 15:33, October 30, 2010 (UTC)
 Rex and ED-E
Please correct me if I'm wrong, but ED-E and Rex are different from human "companions," and instead are "followers." And in New Vegas, you can have one "companion" and one "follower." This is why you can't have ED-E and Rex in your party at the same time. Same reason you can't have Cass and Boone in your party at the same time, they would fill the same party slot. This is in reference to the Note about Rex and ED-E. While I understand there is special dialogue there that gives the impression that it's for some personal reason, but I think that's "flavor" text for an underlying game mechanic. 188.8.131.52 18:59, November 1, 2010 (UTC)
The hell...? De Accipitre Deserta 21:12, November 5, 2010 (UTC)
- where does the stuff about denver come from?
 Bug That elusive Rex
Finished his quest (got that Fiend's dog's brain), took him around for a quest or two after a while, left him in Lucky 38. Tried to talk to him again after a few quests (or maybe more than a few), he's just lying there and my only option is to pickpocket him. Fast forward a couple of dozen of hours: I did 3 of the endings (up to now), in all of them Rex succumbs to the horrors of the desert. Went to get him this time to see if playing with him a bit more would help, no Rex anywhere (King's place included). Almost forgot: PS3 (all this bar his quest after the update)
Edit: Just talked to the King for the King's Gambit quest. He asks where Rex is and apparently (by my possible answers) Rex is dead. Problem is I'm NOT playing Hardcore and Rex was left in my room in 38. Renio 10:52, November 9, 2010 (UTC)
If you get a brain from that old lady the king or somebody tells you about he wont die. And you dont have to pay her seven hundred caps just kill a dog and take brain(I recomend ray)
 Rex not liking Hats and Rats
Is it a humorous note since dogs don't like cats, but rex is a programmed dog and this programmer may have made a typo so Rex don't like Hats, Rats? Maybe even Bats? yes, no?
hes not a programmed dog. he has a dog brain.
- What's the difference? Didn't Pavlov show that they are the same? haha just kidding! --Sp3lly 18:10, February 8, 2011 (UTC)
 K9 Tag
I think that K9 is a reference to doctor who's robotic dog:
- Nope. K-9 directly references Rex's career as a police dog for the Denver Police Department back in prewar times. Police units that use dogs for various purposes (Drug sniffing, Bomb sniffing, Body sniffing, ect.) are often called K-9 units. That, however, is directly referencing the biological classification, Canis, which includes Dogs, Wolves, Ect. It's much more likely that Dr. Who's dog is also a reference to either one of these explanations. --184.108.40.206 07:20, November 29, 2010 (UTC)
- Wow, "K9" is such a stretch of the imagination too, only one person could have ever made the link canine > k9.
Actually I can't help but think of Inspector Rex, the long running German cult show about a German Shepard Police dog called Rex.
Uhhh, hello?? K9 is the name of the robotic dog from Fallout 2. Where any of you saw a reference to him in New Vegas, I have no idea, but that's where that's from.
KayN-i-ne do u get it? ' K9 ' is police short code name for Canine - biology term meaning 'a dog', police term: K9 Unit / Dog Unit, durr! god and some people call me stupit! --CDEagle147A "jesus cripes theres a thousand pigs!!" 03:41, September 25, 2011 (UTC)
 Special Attack?
Rex seems to be able to knock down enemies much of the time, very useful, but I see no mention of it in the article. The first thing I did after acquiring him was to grab a brain from Gibson scrap yard, which made him more vicious, so I'm not sure if it is related to that brain in particular. Can't say I've noticed many other enemies being knocked down by companions, (had 3 others so far). Is it just some random thing or have others noticed the same?
- I've seen Rex knock down enemies too. This was with his default brain. --220.127.116.11 00:38, December 6, 2010 (UTC)
 Rex dead
You guys know of any way to resurrect rex without his body? he died and i didn't even noticed!!!!
prid and his ref code should bring his name up in consul then use moveto player. That should move his entire body to you might want to noclip in the air a bit so it dosent get stuck in the ground or fall though it. 18.104.22.168 08:39, December 18, 2010 (UTC)
 Lose Rex permanently after completing Dead Money?
Under bugs, the page mentions "(xbox) When you are knocked out in Dead Money when you escape, you will be unable to find Rex again." Is this true? Is this permanent? Or does Rex show up again in Freeside after a few days of returning from the Sierra Madre (i.e., after completing Dead Money)? Crap, if you lose Rex permanently just for playing the DLC Dead Money, that is a most unfortunate bug! (In other words it is a P.O.S.) Is there any way around this on the xbox -- like dismissing him before starting Dead Money? --Sp3lly 18:17, February 8, 2011 (UTC)
Edit: "I've tried makeing him wait at the Lucky 38 before starting Dead Money, sooo if your thinking about trying that, don't even bother cause that does'nt even work. But one thing I did'nt know is that you can get Rex back after dismissing him(In regular game)? Cause I tested that on Lily and no text option showed up to where I can get her again." -Scribbles.
Edit: "It's me again and no you don't lose him you can find him at the Kings place in Freeside, after beating the DLC." -Scribbles.
 Police Hat
Does Rex growl at the Courier when he/she wears Dermot's Police Hat? Dr. Lobotomy 18:21, February 8, 2011 (UTC)
 Rex Endings
Does anyone know what ending you get when you place one of the ncr guard dogs their brains into him? Since it doesn't give any bonus i haven't tried it out myself but i'd really like to know. =) (BlitzKrieg-BoB 20:38, February 15, 2011 (UTC))
Edit: I tried getting this NCR Guard Dog Brain or whatever it is called and after killing about 20 NCR Dogs, still no brain drop. I tried looking for it's ID but couldn't even find it on the new vegas misc item list. Does this brain even excist? (BlitzKrieg-BoB 20:38, February 15, 2011 (UTC))
What are ending achievements with Rey/Lupa/Violetta's brains?
I don't think there is an NCR guard dog brain. 101Phase
 Rex Attacking Companions and NPCs
Not sure if anyone else has had this problem on the 360, but sometimes when I returned to the Lucky 38, Rex would growl and start fighting Boone, Cass, or Arcade to the death (mostly Boone). Despite being in casual mode, Rex would die (without the announcement box appearing), sometimes gruesomely, and I could loot his corpse as normal. This has happened when he was left at the 38, not as a current follower.
However, as a current follower at Hoover Dam, sometimes he'd randomly attack a couple of (non-hostile) NCR soldiers when I was looking for Col. Moore.
Just putting it here, since I don't know if it's just a one-time bug or something that can be confirmed by others for inclusion in the Bugs section. I don't know of a fix other than to reload and quickly rehire Rex when he starts growling in the 38, or make him wait away from those particular soldiers in Hoover Dam. 22.214.171.124 04:59, February 21, 2011 (UTC) Kaz
... Confirmed on PC. just happened to me. About 3/4 into game from what I can tell (1st run), roughly.. most non-main quests completed, but Im playing slow the main one. Nothing I can think of out of the ordinary. Rex previously dismissed -within- the L38 suite itself, as I was swapping for EDE; after a few game hours, came back and Rex is attacking.. mainly Cass (seemingly just because she appears to be the closest at the time Im entering the room); also, was not able to have Rex 'heel': i.e, he was not responding as a companion at all. Playing a 'neutral/goodish' char, kinda going for independent New Vegas/lined up with NCR; Cass wearing non-faction power armor. Will update if I learn more how/why. Only thing I can come up atm is that Rex is somehow reverting back to his hatred for hats? (Since all companions have some sort of hat/helmet..) Update: after a few save/reloads I think this bug affects the non-human companion instead. A couple of unsuccessful tries, but I managed to 'talk' to Rex just as I entered the room, after having dismissed EDE on the street.. Immediately, EDE started shooting Cass/Boone.. dont know how far back Im gonna have to go on this one- agh!!
..Update2: After trying unsuccessfully a couple different things, I am now convinced this is an instance of [[[Fallout:_New_Vegas_companions#Fixed|bugs (Patch 126.96.36.199x)]]]; Even though my version is 188.8.131.522; I normally dont leave stuff on companions other than weapons and ammo, but, following the idea from that note, I realized i had left a few purified waters -both- on EDE and Rex, which I hadnt done before (one or the other, but I dont think i had left them both.. I tend to use Rex or EDE as 1st option pack mules since they dont carry the additional weapons/armor/ammo that human companions do, but I usually remove all their stuff as I go by homes) .. so anyway, going back a couple saves, removing the P/waters from Rex and dismissing him.. no trouble so far, about 30 mins realtime (6 hs or so game time?) in new save so far, 2 times back to :38, no problems....
 Rex in Fallout 3?
I was playing Fallout 3 one day, and when I was in Little Lamplight, I found a dog named Rex. Since FNV took place WAAAAY after Fallout 3, could this be a Rex before he was a cyber dog?
--WisestWiseGuy101 00:11, March 8, 2011 (UTC)WisestWiseGuy101
- Not a chance. Rex (Lamplight Caverns) is a normal dog, so he should live the 15-20 years dog normally do (barring any mutations, of course). Rex (cyberdog) was born five years before the Great War. Without technology, Rex (cyberdog) would have died a) during the bombing or b) around 2092 (20 years after his birth). So that means if Rex (cyberdog) and Rex (Lamplight Caverns) were the same dog, if would mean Fallout 3 would have to take place sometime between rgiht after the bombs fell and 20 years after the bombs fell, as to make sure that Rex (cyberdog) stayed alive. But since Fallout 3 takes place in 2277 (4 years before Fallout: New Vegas), this makes it impossible. Best regards, Kastera talk 18:35, March 19, 2011 (UTC)
Just added some information regarding Rex's breed in the notes section, if it isn't relevant feel free to delete it. --Cartman! 23:48, April 11, 2011 (UTC)
 Brains are quest items
I was wondering if you have all three brains will the one you use be the only one that is removed? I don't want quest items clogging up my inventory because they cant be dropped (i play on xbox so no console commands) God damn ghouls 18:02, June 23, 2011 (UTC)
 Inventory Crash
Earlier on in the game, shortly after I gave Rex Rey's brain, I dumped much of my inventory so I could begin the Honest Hearts add on, and later on, (at level 25 with most quests completed), I returned to Rex at The King's School, and attempted to get all my stuff back. I took most of it, but when I got to the shovel, My Xbox froze, and no solution attempted worked. (Placing extra items in and taking them out, placing extra items in and moving from item category, hoping to pass the shovel.) Also, from the limited items I could view from taking the rest before the shovel, I noticed a Survivalist's Rifle with an unknown mod on it. (Had not accessed his inventory since BEFORE Honest Hearts.) Does anyone know a solution?
- Is Mk. III Cyberhound, LEO Support Model, Serial no. B955883 really necessary? it just seems really long and un-needed to me.
 Multiple Companions?
I know Veronica has a bug to get all the companions on your party simeautaneously, but is there a bug/glitch or a mod to allow you to field both Rex and EDE at the same time? :?
Okay, Rex died in my game without me even noticing it. Can anyone tell me how to resurrect it? BTW I'm playing in PS3.
 Health Points
it says max 400hp on stats section but my rex is on 650hp!?!! roundabouts. i got im lupas brain. i can photo n vid if proof needed. on seXbox2, im tired of saying fkn360 allda tym. --CDEagle147A "jesus cripes theres a thousand pigs!!" 04:07, September 25, 2011 (UTC)
Say, what breed of dog is Rex?
--Cyberweasel89 19:39, October 4, 2011 (UTC)
He's a German Shepherd