Original: Although the format of the show and the cast ( and ages ) of characters have varied significantly over the years , the most familiar versions of the show feature a talking dog named Scooby Doo and four teenagers or young adults : Fred '' Freddie '' Jones , Daphne Blake , Velma Dinkley , and Norville '' Shaggy '' Rogers .
Simplified: Though the show , people in it , and their ages have changed , the most familiar versions of the show have a talking dog named Scooby-Doo and four teenagers : Fred '' Freddie '' Jones , Daphne Blake , Velma Dinkley , and Norville '' Shaggy '' Rogers .