K9: Master?
Doctor: (Startled) Shhh! What? K9, why don't you bark or something?
K9: I am not programmed to bark, Master.
(The Stones of Blood, 61Kb)

Doctor: Yes, well listen. Never mind about that. I've got a job for you. Now you've always wanted to be a bloodhound.
K9: Negative, Master.
Doctor: Shush! Yes you have! YES YOU HAVE!
K9: Negative.
Doctor: Hush!
(The Stones of Blood, 62Kb)

K9: Danger, Master! Danger!
Doctor: What?
K9: Unidentified alien.
(The Stones of Blood, 41Kb)

Doctor: Hello, K9!
K9: Master.
(The Stones of Blood, 22Kb)

Doctor: K9?!!
(The Stones of Blood, 11Kb)

K9: Erase memory banks. (K9 sounds) Memory erased.
(The Stones of Blood, 55Kb)

Professor Rumford: What's that?!!
Doctor: Uh, this is my dog. He's called K9.
Professor Rumford: But isn't that rather . . .
Doctor: Oh, no no no. They're all the rage in Trenton, New Jersey.
Professor Rumford: (Amazed) Oh, really.
Doctor: Yes!
Professor Rumford: Do you have to have a license for them?
K9: Negative.
Doctor: No.
(The Stones of Blood, 109Kb)

Doctor: That's my dog!
(The Androids of Tara, 10Kb)

K9: Apologies are unnecessary, Mistress.
(The Androids of Tara, 21Kb)

K9: Insufficient data to formulate a reply.
(The Androids of Tara, 23Kb)