K9 (Rose)

A robot dog belonged to an incarnation of the Doctor who required the use of a wheelchair.

At a point prior to 5 March 2005, someone photographed the Doctor and the robot dog. This photo would later be in the possession of Clive Finch. (PROSE: Rose)

Behind the scenes
Although it is not explicitly stated, the robot dog mentioned in the novelisation of Rose is implied to be a K9 unit.