Shelby is a minor antagonist in Over the Hedge. She is a girl scout and is Mackenzie's sister. She is voiced by Jessica DiCicco.
Shelby can be seen as a symbol of the problems with American youth. She is chubby, cruel, and lazy. Instead of running away or telling Hammy to shoo, she smashes him with a thick book with all her might and sprays him with pepper spray, yelling "Take That!!!". Ironically Shelby has a badge in safety yet ignores the safety instructions to run away. After that Verne ends up on Shelby's face where she screams "Get it off!!" and to get it off Mackenzie attempts to hit Verne with the same book but instead hits Shelby giving Shelby a little taste of her own medicine. When Shelby and Mackenzie complain to their mother, Janis about Hammy, Janis tells them to go inside, have a cookie, and watch TV. When Shelby hears this, she does a fist pump to Mackenzie, instead of asking her mom if they should keep selling cookies. This demonstrates Shelby's lazy attitude which symbolizes kids today and their lack of work ethic. Shelby also has contempt for all animals as evidenced by her over the top, cruel treatment of Hammy of smashing him with a thick book and then pepper spraying him. This is also symbolized by her admiration of the Verminator as when he arrives, she looks up at him in admiration and lets out an "Oooooh." In essence, Shelby represents humanities lack of care or respect for animals or their habitats.