Like Kitty, Bunny is very devoted to her friend, however she more easily succumbed to social pressures when she started dating Mad Dog to become "first rate." His abusive nature caused her to grow a resentment towards dogs, but when he chased Kitty away, she was forced to stay against her will. Her personality as a whole is reminiscent of Kitty's (loving, loyal, etc.), but weaker-willed, quieter, and less passionate in belief.
Bunny lived in the two-bit section of the Wrong Side of the Tracks with Kitty where the two were well known for their happy relationship. For whatever reason, Bunny moved in with her chauvinistic boyfriend Mad Dog whose mistreatment caused Kitty to leave under threat of death. Since then, Bunny has been half-living, her thoughts constantly on her missing friend. When enough became too much and her life was threatened as well, Bunny made an attempt to escape by hooking a caribiner on Mad Dog's collar to a lamp. His guards cut her off, and she was buried to the neck in a large flower pot.
Miraculously, Courage appeared at the window. While Bunny initially became agitated by his appearance, his revelation of the toy mouse Bunny had given to Kitty created a trust between the two and Courage helped her out. They escaped, but were pursued by Mad Dog in his car. Before he could run over Bunny, Courage took the wheel and steered his car onto the train tracks, and into an approaching Amtrak passenger train. Bunny watched the car explode as Mad Dog is left laughing uncontrollably at the hood of the Amtrak passenger train. As the train passed by, Kitty is seen depressed about leaving Bunny, but she discovers Courage and Bunny afterwards. She gives Courage a kiss on the cheek and Kitty awaited Bunny at the Amtrak passenger train's rear.