Animation of a walking horse, after 5 images by Marey taken from "La photographie du mouvement : les méthodes chronophotographiques sur plaques fixes et pellicules mobiles..." by Marey, Étienne-Jules (1830-1904) (<a rel="nofollow" class="external free" href="https://gallica.bnf.fr/ark:/12148/bpt6k34103085/f41.image.mini">https://gallica.bnf.fr/ark:/12148/bpt6k34103085/f41.image.mini</a>). This animation is done with only half a cycle of the pace, ie. that it is eg. always the same front paw which takes a step). The horse being symmetrical, this liberality is not noticeable at first glance.
<a href="//commons.wikimedia.org/wiki/User:Bernard_de_Go_Mars" title="User:Bernard de Go Mars">Bernard de Go Mars</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>