The Ugly Dachshund

The Ugly Dachshund is a 1966 Walt Disney Productions feature film starring Dean Jones and Suzanne Pleshette in a story about a Great Dane who believes hes a dachshund. Based on a 1938 novel by Gladys Bronwyn Stern, the film was written by Albert Aley and directed by Norman Tokar. The Ugly Dachshund was one of several lighthearted comedies produced by the Disney Studios during the 1960s.

Source: Wikipedia