Don't you know what to do with witnesses? Finish him, and make no fuss!Wolfhound ordering his men to eliminate the Marked One
He is one of the original mercenary leaders in the Zone and head of the Mongrels gang. One of his favorite and rightly infamous habits was to shoot off his target's arms, legs, and then the head before it hits the ground using his custom UPD Compact named March.
A short bio, that was omitted from final version of S.T.A.L.K.E.R.: Shadow of Chernobyl game describes him as follows: 
Shadow of Chernobyl
When the Marked One first enters the Wild Territory, he overhears a mercenary identifying his position and asking Wolfhound for further instructions. He simply replies that it's protocol to eliminate all witnesses regardless. After the player kills all the mercs stationed at the area, Wolfhound tries to radio in after hearing some gunshots and upon realizing they were slaughtered, he curses and orders one of his snipers to not underestimate the Marked One.
Suddenly, a helicopter is shot down and Wolfhound laughs at the alleged hopelessness of the surviving Ecologists, thinking he has the upper hand. He tries to persuade Professor Kruglov to hand over the scientific data he is carrying to ensure he will not be harmed but the professor is not fooled; it becomes clear that Wolfhound has no qualms of killing Kruglov and any of his associates regardless of whether or not he has acquired the data.
It is very likely that the player will have to kill Wolfhound while escorting Kruglov to safety. Wolfhound is difficult to distinguish from the rest of his men, but tends to appear from the metal shack where the Loners tend to set up their camp in the helicopter crash site area.
- See also: Walkthrough
Call of Pripyat
In Call of Pripyat, he is not seen but his custom UDP Compact March can be bought from Nimble, which most likely indicates he met his end at the hands of Strelok during his failed ambush in the Wild territory.
- Strangely, Wolfhound never carried a UDP Compact, or any .45 caliber pistol for that matter, during Shadow of Chernobyl. So it is not exactly known how he came into possession of March, though it is possible that Wolfhound gave it to another mercenary for reasons unknown and eventually made its way to Nimble through his numerous connections.
- Wolfhound speaks with a slight foreign accent in the Russian version of the game.