What actors and actresses appeared in The Barking Dog - 1978?

The film you're referring to is likely "The Last Detective" (1978), a British crime drama. This film is often mistakenly referred to as "The Barking Dog" due to a plot point involving a barking dog.

The main cast includes:

* Robert Shaw as Detective Superintendent George "Geordie" Tanner

* John Gielgud as Sir George

* Maggie Smith as Lady Virginia

* Richard Attenborough as James "Jimmy" the Fence

* Peter Bowles as Tony

* Michael Hordern as the Psychiatrist

* Diana Quick as Maggie

If you're referring to a different film with a similar title, please provide additional information.