Ferguson played three different characters on The Andy Griffith Show, two different characters on Petticoat Junction, four different characters on Bonanza, four different characters on Perry Mason (including three episodes as a sheriff), and four different characters on the ABC/WB western, Maverick. He guest starred on other series, including the syndicated Rescue 8, Whirlybirds, and The Everglades; NBC's The Restless Gun, Riverboat, Overland Trail, National Velvet, and Mr. Novak; ABC's The Real McCoys, The Rifleman, The Alaskans, Target: The Corruptors, The Asphalt Jungle, and Mr. Smith Goes to Washington, and CBS's General Electric Theater (hosted by Ronald W. Reagan), and The Texan, starring Rory Calhoun. Ferguson appeared twice in 1956 as Henry Murdock (a name similar to his character in The Pride of the Family) on the syndicated western-themed crime drama, Sheriff of Cochise.