Cacodemon

Cacodemon was the daemon of Separatist. She was a vicious beast in the form of a wolf, symbolizing Grievous' boldness, fierce nature, and swift action.

Cacodemon worked with Grievous in his many battles during the Clone Wars, helping him conquer worlds, kill Jedi, and intimidate his droid troops. Grievous considered her his best friend ever since he lost all his friends and loved ones from his pre-cybernetic life. It was rumored that Cacodemon helped Grievous tame and train his pet roggwart, Gor. Her ferocious fighting skills complemented her cyborg's similar skills in a fight. She also agreed with him that most battle droids, except for the MagnaGuards, were pretty useless.