Belle is one of Snoopy's sisters. His other sister is called Molly. His brothers are called Spike, Andy, Olaf, Marbles, and Rover. Belle is the most notable of Snoopy's siblings as there was also a Belle stuffed animal produced for several years. She looks a lot like Snoopy with long eyelashes.
Belle is Snoopy's sister. In the strip, Snoopy is said to have seven siblings, though you only ever meet five. Belle is the only girl in the family. Belle was occasionally seen in Snoopy's WWI fantasies as a nurse.