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D0g (pronounced the same as dog) is a robot in Valve Software's 2004 first-person shooter computer and video game Half-Life 2. Doctor Eli Vance built D0g to both celebrate and protect his daughter, Alyx, more than two decades prior to the events of Half-Life 2 when she was young. D0g started out as a relatively small, four-foot robot, but as Alyx grew up she added more and more parts to it, "upgrading" it so to speak – and it now towers ten feet high.
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Characteristics
D0g, much like a real dog, is very friendly, loyal and has an intelligent personality. If the player looks at it while it's idle, it may perform a dance. D0g makes friendly and playful noises such as beeps and whines, as well as less-friendly roars when provoked. The robot's body is constructed largely of scrap metal, hydraulics, and wires, with what appears to be a scrapped Combine scanner for a head.
D0g has a zero-point energy device much like the Gravity Gun to pick up and throw things. D0g has amazing strength, and can prove extremely useful through the course of the story, as it can throw large objects (such as vehicles) at enemies or pry open areas which are otherwise inaccessible to Gordon. D0g seems to be completely invulnerable to any damage used in-game; it never takes apparent damage from any source including weapons, fire, or explosions. However, D0g is not invulnerable; he simply has a huge amount of health to make sure he does not die in-game (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.
D0g does not have any combat AI, and all in-game scenes with D0g involving fighting are scripted. If a spawned D0g is approached by something as threatening as a common headcrab, the spawned D0g will flee. If no enemies are present, he will find any nearby small objects and throw them at the player like he did in the game of catch at Black Mesa East.
D0g's character, even though important to the story, also plays a recognizable role as comic relief for the game. His battle sequences are often humorously exaggerated, where player can see him throw large objects like cars at great distances, or furiously attack disoriented and panicking groups of enemies without caring for consequences nor taking any noticeable damage, whether it is crushing a handful of soldiers or taking a dropship head-on.
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