Gilly is Jeffrey Robbins' seeing-eye dog.
Note: This character does not speak, therefore she does not have any lines.
Real World Background
Gilly's name is short for "Gilgamesh"; she was thus evidently named after the mythical King Gilgamesh of Uruk, a legendary Sumerian hero. In view of Gilly's being female, this name choice is more than a little odd, although there is a certain appropriateness, since one of Robbins' novels, written and published before he met Hudson, was Gilgamesh the King. 
Voice Actor: Frank Welker