Roxie

Roxie is a temporary companion in Old World Blues that can be created in the X-8 research center

Background
Roxie is a cyberdog which can be made at the X-8 research center through splicing a dog and a robot. Unlike other companions, it is possible for Roxie to die, even when not playing on Hardcore mode. However, she can be revived by creating her again at the X-8 splicing facility (the Courier will have to use the "clear the splicing area" command even if nothing is on the actual platform before anything else can be spliced).

The holotape to splice dogs and robots is found on a large table downstairs near the institutional test facility door in X-8. To create Roxie, enter the X-8 splicing facility, which is found down a hallway to the left of the entrance of the X-8 facility. Once you go through the door in the left hallway there will be a terminal in which the Courier can use the splicing holotapes.

Roxie does not use the companion wheel, the player character must talk to her to have her follow them or to make her leave. Roxie only follows the Courier around the X-8 facility and will not follow them outside of the facility. If they leave the area, Roxie will stay near the entrance inside the X-8 facility.

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

Behind the scenes
Roxie's endings with Rex refer to their puppies as "Boston Terrifiers," a pun on the dog breed Boston Terrier. In reality, Boston Terriers look quite different from the cyberdogs, who more closely resemble German Shepherds.

Bugs

 * Even if she was created (and even taken through all the training missions), none of Roxie's endings will appear after completion of the add-on.
 * When inside the "Data Retrieval" tests with the night stalker program running, Roxie will attack the night stalkers, even if they aren't hostile due to the Animal Friend perk.
 * Roxie's pathing and/or combat AI will become flawed after a certain point when you take a High School test in X-8. She will insist on attempting to run through a force-field wall, which she eventually realizes she cannot pass through and proceeds to take a detour, to chase down enemies located across the local map, usually resulting in a quick death. She cannot be calmed down and will chase the enemies regardless of any interactions from the player character.