"Running of the Bulls" is a short story by Harry Turtledove. It was published on-line at Tor.com on March 27, 2013. It is written as a pastiche of Ernest Hemingway's The Sun Also Rises. Turtledove uses a favored trope of altering the names of Hemingway's characters, usually in the forms of anagrams or quasi-anagrams; for example, Hemingway's Jake Barnes becomes "Baek Jarns". Like Barnes, Jarns received a wound in a recently concluded war that has rendered him impotent. However, it quickly becomes clear that there is more to this story than just a simple pastiche, as Turtledove also uses anagrams for the names of his countries, creating a fantasy atmosphere. Things take an even more fantastic turn when Jarns and his friends go to "Amblona" to see the running of the bulls, which are in fact creatures like nothing currently found on Earth.
They are in fact Triceratops. Moreover, through a series of clues scattered throughout the story, Turtledove also reveals that the people of this story aren't humans, but are a species of evolved and sentient dinosaurs.