Magnum, P.I. (1980): Season 1, Episode 8

1 - 8: The Ugliest Dog in Hawaii

After an attempted dog-napping, Higgins volunteers Magnum's services to guard a wealthy socialite's quarantined dog. Things get complicated when the dog's former owner, Victor DiGiorgio, who also happens to be a notorious gangster, tries to get him back. In time, "Sir Algernon Farnsworth" finds himself to be the most wanted dog in Hawaii.