Boo

Boo is the pet and companion of the Rashemi ranger Minsc, having joined him shortly after he sustained an injury to his head. While skeptics have suggested that Boo is an ordinary hamster, Minsc insists that he is in fact a Miniature Giant Space Hamster who is intelligent and can converse coherently with him. In the Baldur's Gate series Boo appears as an item in Minsc's inventory and any attempt to remove him is unsuccessful. He also features in Minsc's portrait in both Baldur's Gate I and II but in the second game only his hamster squeaks are heard alongside Minsc's dialogue.