The Case of the Stolen Scooby Snacks (Scooby-doo! and Krypto Mysteries)

Scooby-Doo thinks his pal Krypto deserves a reward. What's a better reward than a Scooby Snack? But when he goes to look for his favourite snacks, they are all gone! Scooby Snacks have been stolen all over the city! Who is snatching the tasty treats?