Sarah Jane, Romana and Leela have each a K-9, so must Harry have one as well. Or maybe the Doctor thought he was too much of an imbecile to have a K-9.
Happy birthday Roger Delgado!
and thanks for 500+ followers!
This is the only job he has had on Gallifrey if you discount his academic career. Well, the only job we know about. A lot of his early life (and his family) is still unknown. You can read about the Doctor’s life before running away from Gallifrey on the Tardis wiki.
The Doctor from Scream of the Shalka was actually the canonical ninth Doctor until the new series was announced. Now he’s an alternative Doctor. It’s a pity, because this episode have faded into obscurity since the new series started.