Digby, the Biggest Dog in the World

Digby, the Biggest Dog in the World is the titular character of a British childrens film with dollops of unexpected satire and comedy released in 1973 starring Jim Dale, and directed by Joseph McGrath. A large supporting cast of British movie stalwarts includes Spike Milligan, Angela Douglas, Norman Rossington, Milo OShea, Dinsdale Landen and Victor Spinetti. The production included composer Edwin Astley and cinematographer Harry Waxman. The film was based on the novel The Biggest Dog in the World by Ted Key.

Source: Wikipedia