- "Help, rats are falling from the sky!"
- — Fatty Johnson
Rats are common rats of an indeterminate species. They appear in various places in the game of Bully. They can be found in the Boys' Dorm and the Parking Lot at night, inside the school's boiler room, and in the residential section of Blue Skies Industrial Park; in other words, the more run-down areas of Bullworth.
Rats can't attack, they just run around in random patterns squeaking. Jimmy can kill rats with his slingshot or a similar weapon. Surprisingly, Stink Bombs kill rats. Jimmy can pick up a dead rat and throw it. If it's thrown at a person it does minimal damage and it's considered as violence. However, if it's thrown in front of them they'll comment on the rat and run away from it.
Rats feature prominently in the mission Rats in the Library, where the Townies have filled book crates full of rats and sent them to the library, whereupon the rats escaped and scared the Nerds and the Librarian. There are also a pair of errands where Jimmy is asked to kill rats. One of these is at the Tenements in New Coventry, the other is at the docks in Blue Skies. If the rats at the docks run into the water, they immediately drown.
Jimmy must completely dissect a rat in Biology 2.
George is a pet rat owned by Bucky. He goes missing early in the year near the cafeteria, and Bucky puts up a bulletin about it. George himself never makes an appearance. It is slightly hinted that he was put into the food by Edna.