The Ugly Dachshund (movie, 1966)

The Garrisons are the "proud parents" of three adorable dachshund pups - and one overgrown Great Dane named Brutus, who nevertheless thinks of himself as a dainty dachsie. His identity crisis results in an uproarious series of household crises that reduce the Garrisons' house to shambles - and viewers to howls of laughter!