Gabe

Gabe is an oversized cyberdog found in the X-8 research center's testing facility in 2281. He is bigger than the other usual police or military cyberdog and is more powerful due to a huge intake of Psycho.

Background
Gabe was the pet of Doctor Borous before the Great War. Gabe's savage nature comes as a result of Borous feeding him excessive amounts of the chem Psycho in his dog food. It is also revealed in dialogue with Borous that he fed him Buffout, explaining his size (standing much taller than the Courier and other cyber dogs).

After the completion of A Brain's Best Friend, Doctor 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 MT. When Borous was talking to him about Richie Marcus and Betsy Bright bullying him, Gabe would sit by his side with his head on his leg. Ultimately, with proper Speech checks the Courier can show Doctor Borous the error in his actions and make him feel remorse for experimenting on his once-loyal pet.

Quests

 * A Brain's Best Friend: Gabe does not need putting down before talking to Borous about it. Killing Gabe can be avoided by running or sneaking past him and digging up the holodisk with Gabe's bark on it (which is placed in a random dig site.) Doctor Mobius' robotic scorpions will appear and proceed to kill Gabe, however, he can be saved if one moves quickly, either by killing the scorpions or by simply leaving the area before Gabe is killed. Borous will thank the Courier for saving Gabe, but there does not appear to be any reward.

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