A dinosaur scientist time travels to the middle ages.
The bizarre beast that rounded the bend in the road made Maker’s mouth drop in surprise. It was like nothing he had ever seen before, a top-heavy, lopsided creature having four legs, a narrow head atop a long neck, and a huge shiny lump on its back.

Variants

(1)
  1. “The Dragon Wore Trousers” by Bob Buckley, in Analog, January/February 2004.
    2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Bob Buckley