The Doctor (The Legacy of Gallifrey)

The Doctor was the name Flavia gave to a Gallifreyan cat she adopted as her pet and advisor after she became President of the High Council.

In adopting an intelligent cat as an advisor, renewing a tradition which had been abandoned after Pandad IV's own cat had been eaten alive by giant mice engineered by the Rani. She named it "the Doctor" due to having become Acting President in the stead of the fifth incarnation of the Doctor, (PROSE: The Legacy of Gallifrey) who had been elected President by the High Council but fled his responsibilities. (TV: The Five Doctors)