Mumsy-Doo is the mother of Scooby-Doo. She was called Mama-Doo when Scooby-Doo was a puppy.
When Scooby was younger, "Mama-Doo" had light brown fur and brown hair. She wore a pearl necklace and a scarf on her head. She also applied lipstick. During Scooby's adulthood she had gray hair, and her fur became a little wrinkly and she wore a pink dress.
She and her husband, Dada-Doo, share several personality traits with Scooby, being scared easily, failing to understand Shaggy's jokes, and loving food. She loves her children very deeply, especially her eldest son. However, whenever Scooby tries to take off the Doo family collar, she scolds Scooby and calls him by his given name, "Scoobert".
- The New Scooby and Scrappy Doo Show: "Wedding Bell Boos!"
- The New Scooby-Doo Mysteries: "A Night Louse at the White House"
- The 13 Ghosts of Scooby-Doo: "It's a Wonderful Scoob", "The Ghouliest Show on Earth"
- A Pup Named Scooby-Doo: "Curse of the Collar", "The Were-Doo of Doo Manor"