trotter

/T R AA1 T ER0/
noun
  1. 1

    In harness racing, a horse with a gait in which the front and back legs on opposite sides take a step together alternating with the other set of opposite legs; as opposed to a pacer.

  2. 2

    The foot of a pig, sheep, or other quadruped.

Source: https://en.wiktionary.org/wiki/trotter