Legion mongrel

s are attack dogs used by the Caesar's Legion.

About
Caesar's Legion use them as help in combat. They look like German Shepherds with large manes that help distinguish them from regular dogs.

Appearances
s appear in Fallout: New Vegas.

Bugs

 * Legion mongrels will still attack the player despite their disguise, if they are hated enough by the legion.

This is not a bug, the game mentions that disguises will not prevent guards and dogs of factions that dislike you from attacking