Dog Diaries: Curse of the Mystery Mutt follows Junior, a dog who loves his person-pal and hates trouble — but trouble just won’t leave him alone! With Halloween approaching and the town preparing for the “Night of the Howly Wiener,” strange things start to happen: howling at night, stolen toys, shredded trash bags, and other canine chaos. Junior decides to investigate: who is this mysterious mutt wreaking havoc?