1. BoJack Horseman
  2. Red Lips
    Sonora Webster's horse. A famous horse diving team.
  3. Secretariat
  4. American Pharoah
  5. Penny
    Felicity's horse in the American Girl books.
  6. Black Beauty
  7. The My Little Pony ponies
    See my previous list from a few weeks ago if you're interested in how they are ranked amongst themselves.
  8. Others?
  9. Bullseye from Toy Story
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    Suggested by @ErinFlaherty
  10. Pokey from Gumby
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    Suggested by @ErinFlaherty
  11. Li'l Sebastian
    Mini-horse/the delight of Pawnee from Parks & Rec
    Suggested by @RachelP
  12. Mr. Ed, the talking horse of yesteryear.
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    Suggested by @Alex
  13. Misty of Chincoteague
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    She had a marking on her side that kind of looked like an outline of America, which is how she won over ALL OF AMERICA
    Suggested by @goobs
  14. Shadowfax
    Suggested by @ChrisK