Herman Lindsay gives his new dog, Fido, an injection to cause the canine to talk. Fido learns to read and write. Herman tells the dog he is to stay with his friends, Ted and Marion Kent. Fido is to inform Herman of the safe combination and when the Kents are to be out of the house. Fido resists, but Lindsay beats the poor animal into submission with a whip. Lindsay commits the robbery, but upon returning to his apartment with the loot, the police show up to arrest him. They had received an anonymous call from an informant who didn't sound human. Fido keeps quiet as the police lead Herman away.