Scooby-Doo, the iconic Great Dane from the animated series, can talk due to the anthropomorphic characteristics typical of cartoon characters. In the context of the show, his ability to speak is often used for comedic effect and character development. His speech is characterized by a distinct, often comical style, including mispronunciations and his signature "Ruh-roh!" catchphrase.
In a more narrative sense, Scooby's ability to talk helps him bond with his human friends—Fred, Daphne, Velma, and Shaggy—as they solve mysteries together. His unique way of speaking adds to his charm and emphasizes his personality as a lovable and goofy character. Ultimately, his talking is a creative choice by the show's writers and animators to enhance the storytelling and entertain the audience.