FIDO

FIDO is the upgraded K9000 cyberdog gun in the Fallout: New Vegas add-on Old World Blues.

Characteristics
Unlike the common K9000 cyberdog gun, FIDO uses .44 magnum rounds instead of .357 magnum rounds.

FIDO is an acronym referring to the archetypical dog's name "Fido", a Latin word for faithful and most famously associated with the name of Abraham Lincoln's dog.

Variants

 * K9000 cyberdog gun

Locations
Inside the kennel in X-8 there are schematics for it, next to the terminal. Then take a K9000 cyberdog gun to a workbench to upgrade it.