Meghan (All the Empty Towers)

From Tardis Wiki, the free Doctor Who reference

Meghan was a donkey in 2089 Blackpool. The Twelfth Doctor helped her after she was shot by Triss and his friends and decided she might like to be called "Meghan". Later, Meghan found the Doctor and Clara and let the Doctor ride on her back. When he thought no one was looking, the Doctor gave Meghan a kiss on the head. (PROSE: All the Empty Towers)