Cyberdog (Fallout: New Vegas)

Cyberdogs, also spelled as cyber dogs, are creatures found in Big MT and the Mojave Wasteland

Military cyberdog
The military cyberdog has a sonic bark which is used as a ranged weapon, and the melee attack has a chance to knock down the Courier. They also appear to have the ability to self heal/repair themselves, similar to the Mk II Securitrons.

Police cyberdog
A slightly weaker variety of the military cyberdog, police cyberdogs may contain several types of small energy cells on death. They can be distinguished from military cyberdogs by their unique black and white paint, as well as the red and blue reflective patches on their backs. They appear in a classroom in the X-8 testing facility during the Old World Blues quest X-8 Data Retrieval Test.

Cyberdog
The cyberdog is a non-militarized version of the police/military cyberdog, it relies on its speed and bite strength alone for offensive power.

Only one instance of the civilian cyberdog exists. It is visually identical to Rex and is explicitly identified as a test version in its Editor ID (NVDLC03CyberDog01TEST). It does not appear anywhere in Old World Blues.

Notable cyberdogs

 * Rex
 * Roxie
 * Gabe

Bugs
The mesh file for the braincase used by military cyberdogs suffers from a flaw which renders it untextured and invisible, rather than a glowing yellow to compliment the glowing green and glowing red seen on normal and police cyberdogs, respectively. This leaves the military cyberdog's brain apparently floating in mid-air with no obvious means of containment.