Rebecca lives with her mother and father as a carriage hound in DeVil Ville, a Renaissance town run by Judge Dimsdale De Vil, one of Cruella De Vil's ancestors, who was cruel and unfair to the citizens. One time, a witch named Hester Hen came to the town and cursed the town for it to only appear every 100 years, and for everyone to forever be happy. The only ones that didn't fall under the curse were chickens, Hester's favorite animal.
During a picnic, Roger and Anita end up in DeVil Ville and were hypnotized to not want to leave, as well as the pups. While Lucky was hypnotized, he became close to Rebecca. Spot broke the curse on Lucky, Rolly and Cadpig by kissing them (since she was a chicken and not subject to the curse), and then kissed Rebecca. She then realized how cruel Dimsdale was, and helped the pups find him to save Roger and Anita from being imprisoned.
After the Dearlys were freed from the curse by Spot's kisses, the town began to vanish again. Although Lucky wanted Rebecca to come home with him, hinting some genuine affection, she refuses because she had to protect her world from its wicked DeVil, as Lucky should be with his. Lucky then left the town with everyone else, and the pups had no memory of that day.
- She somewhat resembles a spotted version of Oddball, except that her spots are heart-shaped.
- She is one of Lucky's three love interests in the series, the other two being Two-Tone and Dumpling.
- She speaks with a prominent Scottish accent, a likely a homage to the stage musical Brigadoon, which "DeVil-Age Elder" is based on.
- She is the only prominent and/or vocal Dalmatian in the series to have no apparent relation to Pongo or Perdita, not even by adoption.