In some early concepts for Dolly, she was only going to wear one collar, with a tag, instead of the three she wears in the show. Some of this concept art also shows that her ears and paws were originally going to be black instead of white with spots, and that she would wear a beanie on her head. According to storyboards of the pilot, she was also originally planned to be called "Daisy", before being renamed Dolly.
Dolly comes from Doug's side of the family and is a confident and mischievous Dalmatian who enjoys messing about. While she does enjoy teasing Dylan, when times get serious, she will show that she does truly care for her family, such as apologizing in "Boom Night" (which Dylan treats as a big thing for her) as well as showing concern for Mister Fuzzy and comforting an emotional Dylan in "Dog's Best Friend".
Dolly is a rather athletic Dalmatian too, shown to often ride about on a skateboard, as well as a brief scene from the pilot showing her trying to bungee jump from Big Ben.
Dolly doesn't like when Delilah says that Dylan is a better child at something than her. It's possible that Delilah expressed her disappointment in Dolly not once, but a few times. In one instance, Dolly once got upset and angry at Delilah due to a misunderstanding to the point that she didn't want to spend time with her.
She and Delilah "never get to spend time together" according to Doug during one Mother's Day when they were on an adventure that wasn't planned, and come to know and understand each other more ("Girls' Day Out"). Dolly once said that she is very proud of her parents and understands they need to work to help humans.
In "My Fair Dolly", she wanted to prove her point to Clarissa ("Dalmatians can do anything") so badly that she accepted a dare from the dogs she doesn't like, and while doing so, Dolly got carried away, to the point where her brothers and sisters started to worry that she would become like a pet and wouldn't return back home. However, despite everything, Dolly didn't forget how much she loves her family and let the puppies give her a "good luck hug". When the puppies started to act like Dolly in her "Camilla" image and offended Dorothy, Dolly quickly threw that image off to return to her family.
- She has a crush on a husky named Hansel. However, Dolly doesn't have an ability to write poems ("serious poetry"). She goes with the "silly songs" as she calls them, or "freestyle" (as called by Dylan), or "hip hop" (by Hansel).
- She knows the "trigger words" of her siblings in order to either mess with her stepbrother Dylan or get out of sticky situations. So far the "trigger words" revealed are: "ball", "group hug", "walkies", "dinner", "breakfast", "sticks", "jump", "park", and "fetch".
- According to "The Daily Puppy", a newspaper given out to promote "101 Dalmatian Street", Dolly is twelve years old in dog years.
- One of the "Dogs vs. Humans" web promotions revealed that Dolly loves to pop bubble wrap.
- In the "Boom Night Rescue" game, Dolly's special ability is a speed boost, making it easier for her to place ear protectors on the other Dalmatians running about the park.
- In "The Woof Factor", Dolly is seen having an uncontrollable urge to chase a golf cart as it passes the set, resulting in Dylan having to chase after her to snap her out of it. This means Dolly has a prey drive that sometimes instinctively compels her to chase moving vehicles.
- Her design resembles Cadpig from the 1997 series, "due to having the same floppy ears". This is likely coincidental, however, as the show creators have claimed that they deliberately didn't watch any of the franchise's past sequel and spin-off material (including 101 Dalmatians: The Series), only the original novel and first animated film.