The trot

To trot, a horse moves diagonally opposite limbs at the same time—the right-front/left-rear legs, and the left-front/right-rear legs. When you consider arms as forelimbs, people employ the same pattern when they run.

Side view of a horse trotting in mid-stride with the right-front and left-rear legs stepping forward
Trot: Right-front and left-rear forward
Side view of a horse trotting in mid-stride with the left-front and right-rear legs stepping forward.
Trot: Left-front and right-rear forward

Example of a mouse trotting

Video of mouse trotting (no audio)