A model of K9 lived with the Tenth Doctor in the TARDIS. K9 joined the TARDIS team while Rose Tyler was still on-board, but the robot would initially spend most of his time within the TARDIS, rarely mentioned or seen. K9 only began to actively join adventures after the Doctor adopted a cat, whom he named after Rose. The two did not get along.
Biography 
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K9 travelled with the Doctor during his adventures with Rose Tyler. Rose and the Doctor once considered purchasing a cat, but decided that K9 was enough for the team. (COMIC: Untitled)
After the departure of Rose from the team, the Doctor would decide to purchase a cat, just as Rose had suggested. K9 and Rose did not get along, and fought within the TARDIS on several occasions. (COMIC: A Rose by Any Other Name)
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