The TARDIS Databanks: Online

Biographical Name      Blitz
Homeworld      Earth
Profession      Pet
Age      56 (appears 3)

Physical Species      Feral - German Shepherd Dog
Gender      Male
Height      63 centimeters (2 feet and 1 inch)
Weight      35 kilograms (5 stone and 8 pounds)
Hair Colour      Tan and black
Eye Colour      Amber

Notes Skills      Regeneration, agelessness, sentient-level intelligence.
Attire      A purple collar.