Sophie is Claudia Furschtein's small dog who dislikes her brother, Klaus, in The Chipmunk Adventure.
Sophie is believed to be a Yorkshire Terrier. She is perceived to be nice at the beginning of the film, but proves to be just as cold-hearted as Claudia is.
Acts of her wild nature include:
- Ripping one of Klaus Furschtein's Pierre Cardin´ socks.
- Popping Klaus' floating pool chair for him getting just a drop of water on her.
She seems to only have sympathy for Claudia and very little, if any, for Klaus.
She is the very best friend to Claudia.