Snowball is a West Highland Terrier.
Ms. Peabody, Charles's Grandbuddy.
Snowball was found at a gas station, sick. He was taken to Dr. Gibson, who allows the Peterson's to foster him. He is very smart, and in Shadow's book, it is said that he learned how to put his toys away, then gets a treat. Lizzie believes that he is smarter than Goldie.