When it comes to describing a horse that is moving at a moderate pace, there are a variety of synonyms to choose from. Some possible options for "trotting horse" could include a jogging horse, a pacing horse, a clip-clopping horse, or a prancing horse. Each of these terms conveys a slightly different image of the horse's movement, with "jogging" suggesting a more relaxed gait, "pacing" indicating a more even and rhythmic stride, "clip-clopping" evoking the sound of the horse's hooves on pavement or hard ground, and "prancing" hinting at a more spirited or lively gait. Depending on the context, any of these synonyms could be a suitable alternative to "trotting horse".