See video below the progressive still frames.

Watch the front legs first. See how the right leg stays planted with weight on the ground until the left is put down. Next watch the rear legs. They too should bear weight until the opposite one is put down. (This is one of the key factors to any gaited horse producing a smooth ride.) Next watch either the left or right side and ignore the other. You will see how the rear leg comes forward and almost hits the hoof in the front before the front is picked up. This is called diagonal movement. On a horse that's laterally gaited (pacey) you will see the front hoof picked up too soon and travel forward with the rear hoof on that same side of the horse. Also, when a horse is foxtrotting their tail will have a pronounced bounce, which will ripple down it with each stride. (This is easier to see in real time video.)

Click on the link if the video is not showing and it will download to your computer for playback on Media Player....DollieSlowMotion