Doctor Whoof /Whooves, also known as My Little Time Lord, is the nickname of a background earth colt from My Little Pony: Friendship is Magic. He is a light brown pony with a dark brown mane and light blue eyes. Fans refer to him as the Sole Survivor of Gallopfrey. He is called Doctor Whoof because of his hourglass cutie mark and his spikey hair, which makes him resemble the looks of David Tennant, the previous actor and tenth incarnation for Doctor Who.
I have a sudden desire to watch My Little Pony now :P