Gabe

Gabe is a cyberdog found in the X-8 research center in 2281. He is bigger than the other usual Police- or Military Cyberdogs, and is more powerful due to a huge intake of Psycho.

Background
Gabe was the pet of Dr. Borous before the great war. Gabe's savage nature comes as a result of Borous's feeding him excessive amounts of the chem Psycho in his dog food. This could explain Gabe's size as well as his hostility towards the Courier.

After the completion of A Brain's Best Friend, Dr. Borous reveals that Gabe was his only friend during his rough childhood, and was the only loyal animal when he was working at the Big Empty, saying that while he was talking about Richie Marcus and Betsy Bright, Gabe would sit by his side with his head on his leg, and after mutating and experimenting on him so much shows remorse for his actions.

Quests

 * A Brain's Best Friend: You do not have put Gabe down yourself before talking to Borous about it. You can avoid getting Gabe's blood on your hands by running or sneaking past him to the playset with a shovel in your inventory and digging up the holodisk with Gabe's bark on it.  Unfortunately, Mobius' robotic scorpions appear and proceed to kill Gabe.
 * Either way that you choose to handle this quest, neither the dialog of Mobius nor Borous is altered, with Borous still commenting that you put Gabe down.

Appearances
Gabe appears only in Fallout: New Vegas add-on Old World Blues.