Delivery boy Horace DeBussy “Sach” Jones meets wealthy sophisticate Don Clark while making a delivery at a travel agency and is surprised when Clark sets up a meeting with him later that day. At the meeting, Clark introduces Sach to his partners British Drake Cummings and sexy blonde Babs, then offers Sach $2,800 in advance if he will accept the job of escorting Gloria, a valuable standard poodle, to London. When Sach is incredulous, Clark explains that he and the others fears dognappers might kidnap the prize-winning Gloria. Unknown to Sach, Clark and the others are members of a diamond ring that plans to use a false piece of fur on the dog to transport their latest shipment. Delirious over the vast sum of money, Sach accepts the job. When Sach tells his friends Stanislaus "Duke" Coveleskie, Chuck and Blinky about the unusual offer, they mistake Gloria for a gold-digging woman. Determined to protect their friend, Duke and the others arrange to stow away onboard Sach’s cruise liner. Meanwhile, Clark, Cummings and Babs order Sach to ignore them during the cruise and never to let Gloria out of his sight. Upon arriving at the boat, Clark and the others are disconcerted to find Scotland Yard Inspector Saunders there. Saunders is onboard to keep tabs on Clark and his gang, whom Scotland Yard has long suspected are behind the diamond smuggling. When Sach sees Duke and the boys he leaves Gloria with Saunders in order to greet his friends. Later, when Babs scolds Sach for deserting his charge, Duke and the boys intervene, believing that Babs is the gold-digging Gloria. The crossing is uneventful, but as the ship nears London, Duke convinces Sach to turn over Gloria to Clark as soon as possible so they can enjoy their vacation. Against orders, Sach takes Gloria to Clark’s cabin where he interrupts an interrogation by Saunders. To allay Sach’s suspicions, Clark makes him understand that Saunders is a notorious dognapper. Fond of Gloria, Sach spirits her away, agreeing to meet the gang in a London hotel after they dock. When the boys settle into their hotel room, Sach worries about Gloria’s lethargy and decides to take her to a local veterinarian, Dr. Rufus Smedley, who recommends an x-ray. While Sach and the boys wait for the results, Sach sees Saunders and his partner, Inspector White, watching the building, and believing they intend to abduct Gloria, flees before Smedley’s return. When Smedley realizes Sach has fled, he steps outside to look for them and meets Saunders who questions him. Smedley tells the inspector that the x-ray revealed a large stash of diamonds and jewels packed into Gloria’s fur. Convinced that Sach is the crime ring mastermind, Saunders and White pursue him. At the hotel, when Sach leaves the room to phone Scotland Yard to report Saunders, Gloria wanders out. When Clark and Cummings come to claim Gloria, Sach realizes with horror, that the dog has vanished. After Saunders and White arrive, Sach and the boys knock them out and tie them up, then call the police for assistance. When the police arrive and the boys realize their error, they flee in fright, running to separate floors to continue their search for Gloria. Saunders chases Sach into a guest’s room, where he mistakes her large poodle for Gloria. Sach escapes out the window onto the building ledge and climbs into another room. Sach rejoins Duke, Chuck and Blinky in the hall where they find a trail of diamonds leading them to Gloria just as Saunders arrives to arrest them. Clark and his gang then surround the group and at gun point, demand the diamonds. When Duke kicks Clark’s gun away, Sach catches it and turns it over the Saunders. After the arrest of Clark’s gang, Scotland Yard honors Sach and the boys for smashing the smuggling ring and Sach shares Gloria’s prize of a bone.