Decoy for a Dognapper

When a rash of local dognappings alarms prize-winning dog trainer Buck Masters, the gang offers to have Scooby-Doo pose as a decoy to catch the dognappers. However, their plan works too well as Scooby is himself dognapped, leading the gang to discover that the dognappers appear to be under the command of a ghastly witchdoctor and geronimo is scaring everyone away.