Scooby-Doo is a fictional Great Dane who can talk, and his ability to speak is part of the show's comedic charm and appeal. In the context of the series, Scooby is a unique character with a personality that allows for human-like characteristics, including speech, which serves to enhance the storytelling and humor.
The creators of Scooby-Doo designed him to interact with the human characters, particularly Shaggy, in a way that adds levity and fun to the mystery-solving adventures. His speech is often a mix of dog-like sounds and human language, often accompanied by a distinctive and humorous style. This anthropomorphism makes the character more relatable and entertaining for audiences, especially children.
In essence, Scooby's ability to talk is a creative choice that aligns with the show's premise of combining mystery, comedy, and adventure, making him an iconic and beloved character in popular culture.