{{Character Infobox
|image=Dog poised.jpg
|birth= Created during Alyx's childhood
|gender=None; referred to as male
|height=2.5 meters (8 feet)
|weapons= Manipulators
|equipment=Right hand-mounted Zero Point Energy Field Manipulator
|eye= Red photoreceptor
|era=The Uprising
|affiliation=The Resistance
|designer=*Dhabih Eng
*Marc Laidlaw
{{Quote|The first model was about yay high. I've been adding to him ever since.|Alyx Vance|Half-Life 2}}

'''Dog''' is Alyx Vance's "pet" robot, built by her father Eli Vance|Eli to protect her when she was young.



Dog is a robot, built by Eli Vance to protect his daughter Alyx when she was a child. Dog's original model was around one meter in height, but as Alyx grew older, she began adding upgrades and new parts to Dog, and he towers around 2.5 meters tall at the time of ''Half-Life 2''.''Half-Life 2'', ''Half-Life 2 storyline Mesa East|Black Mesa East'' 


====''Half-Life 2''====
FileDog Alyx BME.jpg|200px|right|thumb|Alyx and Dog in the Black Mesa East scrapyard.

Gordon Freeman is first introduced to Dog in the Black Mesa East scrap yard. As part of a tutorial on operation of the Zero Point Energy Field Manipulator|Gravity Gun, Alyx arranges a game of "fetch" between Gordon and Dog, using an inert Rollermine|Combine Rollermine as the ball, until they are interrupted by a Combine assault on the Resistance facility. After heading back inside, Dog opens for Gordon the door to an unused tunnel leading towards Ravenholm, to aid his escape after he gets separated from Alyx. While Gordon enters the tunnel, Dog stays behind to help Alyx and the others defend the lab.

Gordon meets Dog again after he and Alyx teleport from Nova Prospekt to Kleiner's Lab at the end of the chapter ''Half-Life 2 storyline''. The company splits again when Gordon and Dog set off to find Barney Calhoun, Alyx deciding to stay with Dr. Kleiner who refuses to leave without his pet Headcrab Lamarr. As the chapter ''Half-Life 2 storyline One|Anticitizen One'' begins, Dog is quick to leave Gordon behind and charge at a nearby group of Combine troops outside the lab, tossing a ruined car at them and even fighting off an Armored Personnel Carrier|APC. He then forces open a Combine Barricade gate for Gordon, allowing him to proceed. However Dog goes berserk immediately after and jumps on a Combine Dropship whilst trying to attack it, departing into the unknown. It is worth noting that this whole scene – unlike other sequences where supporting characters fight alongside Gordon – is entirely scripted, and as such requires no involvement from the player at all.

Dog eventually manages to find Barney, and Gordon meets both of them in the square toward the end of the chapter ''Half-Life 2 storyline#"Follow Freeman!"|"Follow Freeman!"'', in a scene where Dog, in the heat of the battle, knocks over a column topped with the large statue of a Earth creatures. As Barney reports to the player, Dog is probably aware of the fact that Alyx is already in the Citadel, and so tries to reunite with her, being completely uncontrollable by others. The last time Dog is seen in ''Half-Life 2'' is when he once again opens a passage for Gordon, this time allowing him to proceed to the Citadel's foot, by lifting a heavy section of Combine Smart Barrier, uncovering an ancient sewer tunnel.

====''Half-Life 2 Episode One''====
FileHl2ep1 alyx+dog.jpg|200px|left|thumb|Alyx conversing with Dog.

''Episode One'' opens with Gordon lying in the darkness under a pile of rubble. The sound of Alyx and Dog searching for him leaks through, and after lifting up a large slab of rock, Dog's head and eye appear through a hole. He seems elated, and quickly lifts Gordon out of the rubble. 

After Gordon's recovery, Dog helps Alyx contact her father, using his metal body as an antenna by twisting his hand to get a better signal. After much deliberation, Alyx and Gordon decide to enter the Citadel, however they are blocked by a large ravine. Dog runs off in search of something, and soon throws over a large empty car. Testing the distance by throwing a rock over the ravine, he lets Alyx know that her and Gordon are to climb into the car, allowing him to throw them over. Eventually Alyx concedes, telling Dog to go back to Eli after he has thrown them. Gordon and Alyx both get into the vehicle, before Dog picks it up and throws it across the dividing ravine. Dog is not seen again for the rest of the game.

====''Half-Life 2 Episode Two''====
FileDog vs Strider Outlands.jpg|200px|right|thumb|Dog about to prove his strength against a Strider, as seen in the ''Episode Two'' trailer.

In ''Episode Two'', Dog appears late in the game in the Outlands, when Gordon and Alyx have nearly reached White Forest. When the duo is forced to stop their Muscle Car|car because of a gate, a Strider that was lying on the ground wakes up. Fortunately, Dog appears quickly and takes down the Strider in an epic battle, with little regard for his own well-being. After narrowly avoiding being crushed multiple times, he manages to tear off the casing of the Strider's control mechanism and subsequently shuts it down by removing its "brain". 

Afterward, Dog challenges Gordon to beat him to the base in his car. If the player is able to beat Dog, Alyx will mock Dog by saying "Better luck next time, slow poke." However, if Dog wins, he will dance around triumphantly. Dog is then left outside to help MIRT patrol the area while Gordon and Alyx continue on to meet Eli and Kleiner.

Towards the end of the game, after the closure of the Superportal, Dog appears once again. He greets Alyx but is distracted by something in the distance, and goes running off much to Alyx's dismay. Whilst Dog is gone, Eli, Gordon and Alyx go into the hangar to get to the Mil Mi-8|helicopter, but are ambushed by Combine Advisors who kill Eli, inserting their appendage through the back of his neck, breaking his spinal column. Before the Advisors manage to repeat the horrific process on Gordon and Alyx, Dog shows up in the nick of time, narrowly avoiding the death of Alyx. He manages to injure one Advisor considerably, jumping onto its back and smashing it to the ground, whilst the other flees from his attacks relatively unscathed. As Alyx cradles her dead father, Dog leans over, watching in confusion and sorrow.

===Personality and skills===

Dog, much like a real WikipediaDog|dog, is very friendly, loyal, and has an intelligent and excitable personality. Similarly to Barney Calhoun, Dog provides  comic relief throughout the games with his quirks and many strange and odd decisions, even dancing when he is looked at for a period of time. Dog makes friendly and playful noises such as beeps and whines, emulating the sounds made by a real dog, especially when he is around Alyx. When either he or Alyx is threatened, he can be a dangerous foe, using his immense strength and weight to smash enemies to the ground or tear them apart. This makes him a crucial asset in any battle, as he can destroy Striders with ease and hurl heavy objects at targets. 

Dog's body is constructed largely of scavenged scrap metal, hydraulics and wires. He has what appears to be a scrapped Combine City Scanner for a head, though with only three flaps while normally Scanners have four. He is WikipediaQuadrupedal|quadrupedal, walking on his knuckles like a gorilla.

One of his main forms of emotive outlet is his eye, which has an wikipediaAperture|aperture used in much the same way as the human eye to show feelings by opening and closing. His head flaps also move according to his mood.

FileEp1 citadel 000018.JPG|thumb|left|Alyx and Dog at the foot of the Citadel.

Alyx treats Dog much like a pet dog, calling him "boy" and using similar body language and voice as when talking to a real dog. She pats her upper thighs when calling him at Black Mesa East, and tells him to "fetch" when Gordon throws the Rollermine. Their relationship is also much like that of a dog and its master; they have a mutual trust and friendship, which has grown over the years so that Alyx now trusts Dog's opinions and hunches, as crazy as they may sometimes appear. She also has come to accept his sometimes erratic behavior, when he runs off without warning only to appear again moments later. Their relationship differs from the traditional dog and master relationship in the sense that Dog is considerably more intelligent than most real dogs, and is also much larger and more powerful than any human. However, these differences rarely come between them and their friendship seems very deep, so much so that Alyx shows many signs of affection for Dog. He also seems to have something of a sixth sense, being able to determine where Alyx is, no matter the situation. When Alyx is inside the Citadel, he is eager to get in and rescue her.

Dog has a Zero Point Energy device, much like the Gravity Gun, built into one hand so that he can pick up and throw things. He has immense strength, and proves extremely useful through the course of the story, as he can throw large objects (such as vehicles) at enemies or make way to areas which are otherwise inaccessible to Gordon. His thick plating and large size render him invulnerable to most threats he may encounter.

==Behind the scenes==

FileDog concept.jpg|thumb|250px|right|Concept art.

*Dog does not have any combat AI - all in-game fight scenes with Dog are scripted. If a spawned Dog is approached by anything threatening, even a common Headcrab, he will flee. If no enemies are present, he will find a nearby small object and throw it at the player, as if playing "fetch".

*As mentioned in the ''Half-Life 2 Episode One'' Developer commentary|commentary, players' feedback towards Dog were very positive. As a result, Valve made him the first thing to be seen at the start of the next game.''Half-Life 2 Episode One'' Developer commentary|commentary

*Dog was one of the few ''Half-Life 2'' concepts that went through very little revision before being finalized for the game. Designers were inspired by classic movie robots, such as Robbie from ''WikipediaForbidden Planet|Forbidden Planet''.''Half-Life 2 Raising the Bar''

*Early texture sheets from the playable Half-Life 2 Beta|''Half-Life 2'' Beta show that Dog was to feature other colors, such as aqua blue, maroon, pink or green. His head was also to be made out of a scrapped Combot, the direct predecessor to the City Scanner.Playable Half-Life 2 Beta|''Half-Life 2'' Beta files


*Although Dog is seemingly invulnerable to damage, he simply has a huge amount of health to make sure he does not die (as opposed to using very fast regeneration of health, as Alyx does). It is possible for him to die, but this can only be observed if the player spawns him using the console in a combat situation that he would not normally be involved in.
**If Dog takes damage smoke will appear.

*The aggressive roars that Dog makes when provoked are very similar to the noises that Striders make.

*If the player hits or attempts to grab Dog with the supercharged Gravity Gun, corpses of Dog will appear.



FileConcept art eli gordon alyx skitch.jpg|Concept art of Eli Maxwell, Gordon Freeman, Alyx Vance, Skitch, and Dog in the back, made during the first year of ''Half-Life 2'''s development.
FileDog 2003 model.jpg|Dog model, with slight differences from the final version, as seen in the playable ''Half-Life 2'' Beta. 
FileDogSheet1.png|Old texture sheet.
FileCity17 destroyed.jpg|Concept art for the beginning of ''Episode Two'', showing Dog, Alyx and a Rebel overlooking the destroyed City 17.


====''Half-Life 2''====

FileSpray dog.png|''Half-Life 2 Deathmatch'' "Dog crossing (Xing)" spray.
FileDOG model.jpg|Dog model.
FileOverwatch soldiers dog pwnd1.jpg|Overwatch Soldiers about to be killed by a van thrown by Dog.
FileOverwatch soldiers dog pwnd2.jpg|Overwatch Soldiers being killed by an Armored Personnel Carrier|APC thrown by Dog. 
FileOverwatch soldiers dog pwnd3.jpg|Ditto.

====''Half-Life 2 Episode One''====

FileDog finds gordon.jpg|Dog finding Gordon at the foot of the Citadel.
FileEp1 citadel 000038.JPG|Dog looking at Alyx.
FileEp1 citadel 000039.JPG|Dog pondering.
FileEp1 citadel 000042.JPG|Dog throwing a van.

====''Half-Life 2 Episode Two''====

FileDog vs Strider poster.jpg|Dog vs. Strider poster.
FileDog challenge.jpg|Dog challenging the Strider in the ''Episode Two'' trailer. 
FileDog challenge strider legs.jpg|Ditto.
FileEp2 outland 12a0108.jpg|Alyx and Eli watch as the Superportal is shut, with Dog in the back. 
FileEp end 39.jpg|Dog attacking an Combine Advisor|Advisor.

==List of appearances==

*''Half-Life 2'' {{1st}}
*''Half-Life 2 Deathmatch'' {{C|Spray only}} {{Nc}}
*''Half-Life 2 Raising the Bar''
*''Half-Life 2 Episode One''
*''Half-Life 2 Episode Two''
*''Randolph the Red-Nosed Turret'' {{Nc}} {{Mo}}

{{Imagecat|Dog images}}


CategoryHalf-Life 2
CategoryHalf-Life 2 Episode One
CategoryHalf-Life 2 Episode Two
CategoryResistance technology

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{{Article Talk}}

==Combine Units template==

I'm not sure this should go with the Combine Units template. This was cut from the game. It should go into a "deleted enemies" section. 
-- UserDonut THX 1138|'''Donut THX 1138''' User talkDonut THX 1138 |Comm

Um, I've heard the second version of the Assassin go by the name of a Prowler. Maybe it was meant to be a seperate enemy? UserDark Ridley|Dark Ridley 2024, 24 July 2008 (UTC)

== Episode Two? ==

What the hell does HDR lighting have to do with Combine Assassins, and where the hell is the source of that information?
*Your were right to removed it, I should have done it. And please sign your comments! It's a wiki here! UserKlow|Klow 0918, 10 September 2008 (UTC)
**Where was that screen shot taken?
*First, sign your comments. Second, use proper Wiki formatting. Third, click on the image, all the information you need is there. Thank you. UserKlow|Klow 2209, 13 December 2008 (UTC)

== Fate ==
Does anyone realy know why this enemy was cut? all it seem to say is that the combine elite inherited the helmet but it does not say why it was cut in the first place. UserHengara|Hengara 1600, May 26, 2010 (UTC)
Most of the time an enemy is cut because there are too many enemies, and that developer teams prefer a few completed and satisfying enemies that many, incomplete and lame ones. I guess something similar happened to the Combine Assassin... UserKlow|Klow 1654, May 26, 2010 (UTC)
Yeah probably but aas far as i can see this enemy does not seem to be such a "lame one" tho i do see your point UserHengara|Hengara 1423, June 1, 2010 (UTC)
Indeed, many cut content does not seem that lame, but Valve knows why. And as far as I know I understand why most of the cut content was cut. When you go play through AirEx for instance, it's not that impressive. Of course it's unfinished, but still. Another example is the Hydra; they explained why it was cut, and after seeing it in-game, you understand. UserKlow|Klow 1622, June 1, 2010 (UTC)
Another reason for the Combine Assassin being cut may be that it's too much a "Combinized" Black Op, and that Valve didn't want to make an HL1 remake, thus removing the Bullsquid or the Houndeye, and emphasizing the introduction of brand new enemies to the series such as the Synths and the Antlions. UserKlow|Klow 1624, June 1, 2010 (UTC)
aah yeah of course, that makes sence, and they did a darn good job making HL2 an individual game in that way as far as i can sayUserHengara|Hengara 1742, June 1, 2010 (UTC)
They look so cool. But I barley see the black ops female looking anything like the combine assassin.Only the agility seems to fit. They could of made them elite guards or turn them into scouts. And also what kind of picture is the one on the bottom looking like zombie survival sever.--UserCommander maddox|Commander maddox 1522, June 8, 2010 (UTC)
Are you asking something? What picture are you referring to? UserKlow|Klow 1630, June 8, 2010 (UTC)

|description=Alyx and Dog in Black Mesa East's scrapyard.
|source=''Half-Life 2''
|other versions=
|cat artist=
|cat subject=CategoryAlyx Vance imagesCategoryBlack Mesa East imagesCategoryDog images
|cat type=CategoryHalf-Life 2 screenshots

|description=Dog suggests to Alyx to get into the wrecked car with Gordon.
|source=''Half-Life 2 Episode One''
|other versions=
|cat artist=
|cat subject=CategoryAlyx Vance imagesCategoryDog imagesCategoryCitadel imagesCategoryCar images
|cat type=CategoryHalf-Life 2 Episode One screenshots