Ditzy Doo understands the doctor, his pain, his heroism, and what makes him "The Doctor" and even though she loves him, she can never tell him so...

Because eventually she would end up hurting the Doctor, and she would rather break her heart before hurting him.

Cheerilee, distinguished teacher of Ponyville, has been assigned to Caretaker of a unicorn to teach about "How to Live Sober" to the "student".
Once she reaches the unicorn's home however, she did not expect for the unicorn to be a stallion. Or to be quite..... unique. Mentally.
His name is Sherlock Holmes. He just moved to Ponyville all the way from Trottingham.
And his deduction skills are quite phenomenal.
As she will unfortunately soon find out.

(Crossover between Elementary and MLP. I own nothing.)

Perhaps Doctor Whooves is not a medical doctor or a time lord, but a doctor of psychology.

The following are his journals after he receives instructions from Princess Celestia to permanently set up shop in Ponyville to keep an eye on Twilight Sparkle and her friends, where he learns more than he bargained for.

View the Google Docs table of contents: https://docs.google.com/document/d/1gCeHce9BTZ48P5fxNQDHq7diYlNqJIbkZNdMGLN3H5k/edit?pli=1

It was a a beautiful night in Ponyville. Twilight and her best friends are out sky gazing when suddenly a mysterious craft crash-lands in the Everfree Forest. The six ponies rush in and discover a crippled Dalek. Unknowing of the Daleks's evil nature they take the Dalek under their wings. With more Daleks on the way, a mysterious evil fobs watch, and no Doctor in sight, can Equestria survive the invasion?