Cerberus (My Little Pony)

Cerberus is the watchdog of Tartarus and a minor antagonist in My Little Pony: Friendship is Magic.

Appearance
Unlike various versions of Cerberus in many depictions, this version of Cerberus is different and has the heads of a bulldog.

Biography
Cerberus is responsible for watching over Tartarus and preventing any creature from escaping. One day he attacked Ponyville, causing destruction in front of the citizens. Twilight Sparkle tried to stop him but failed when he barked in her face, but Fluttershy managed to calm him by giving him a belly rub. She then threw a ball at him to send him back to Tartarus.

However, it is mentioned that during that event while Cerberus was away, Tirek, a power-hungry centaur escaped from Tartarus. Because of this, Twilight was tasked with defeating Tirek after Discord befriended him. After Tirek's defeat, Cerberus could be seen briefly, once again standing guard over Tartarus.

In "School Raze - Part 2" Twilight uses her magic on Cerberus in order to escape Tartarus with her friends and turns him into three black dogs.

In "The Beginning of the End - Part 1" Cerberus is back in his normal form watching over Tartarus.