The Real Origin Of Shaggy & Scooby

My origin story for Scooby and Shaggy isn't like Scooby Doo: The Mystery Begins or Scoob, but it is rather told in the I.B.F.F Diaries series:

When Shaggy was 8, he was given a puppy for Christmas. However, the puppy got frightened at ghost stories from Shaggy's big brother's ghost stories as much as his young owner, but loved to dance to jazz music on the radio. Thus, Shaggy named him Scooby Doo, and a friendship was formed. For the rest of their childhood, Shaggy, Scooby and childhood friends Fred, Daphne and Velma hung out after school and played at solving mysteries together, sometimes playing at being pirates or jungle explorers. Scooby had a big appetite and loved playing scuba divers with Shaggy in the bath, resulting in Super Soaker water fights that often got Shaggy into trouble. Scooby would accompany Shaggy at meal times, finishing off scraps and sometimes eating the whole thing when Shaggy would refuse to eat his greens. Sometimes, Scooby would finish eating Shaggy's cereal after Shaggy took the first bite! Scooby was the one who taught Shaggy how to make great sandwiches, resulting in the sub sandwiches we see them eat today.

One day, the gang became nationwide heroes when they solved the mystery of Shaggy's stolen bike and unmasked a mysterious green ghost. In their next treehouse meeting twelve days after the newspaper reported their fame, they decided they should become forever known as the Mystery Inc. gang - thus, the meddling kids we all know and love got the name we recognised today. In order to coincide with his fame, Scooby made his own line of doggy treats, named Scooby Snacks, which the gang would feed him on their travels. When they reached high school, they got a part time job hunting for ghosts and ghouls - this first happened when the gang went on a school field trip to see a film, and they went to the museum the day before, and their first case, involving a knight in shining armour who came to life, became headline news, and thus the Mystery Inc gang were hired for various cases involving ghosts and ghouls.

And this, my friends, is how they became the Scooby Gang, from childhood to adolescence. Scooby-Dooby-Doo!