Belle is Snoopy's sister. She first appeared in Peanuts on June 28, 1976, although she was referred to for the first time a few days earlier on June 22, 1976. Belle has a tall thin unnamed son. Her son is supposed to be a pure-bred beagle, although Snoopy thinks he looks more like the Pink Panther. Belle only made a few appearances in the Peanuts comic strip.