The four-year-old, whose show name is Cobyco Call the Tune, beat six other well-groomed hounds in the final to nab the title at the four day event.
More than 21,600 pooches from 22 countries took part at the National Exhibition Centre in Birmingham.
Deedee's owner, Lynne Yacoby-Wright said she was delighted but tired. Deedee seemed to take it all in her stride. She said: "Woof, bark, grrr."
Winners in the gundog, hound, pastoral, terrier, toy, utility and working categories were in the last six.
Runner up was a Scottish Terrier called Puzzle.
As for Deedee, she's off for a rest.
Mrs Yacoby-Wright said: "Deedee sleeps on the bed with me and has done so since she was a puppy. She will be there again tonight."