What is this called?
 

When a horse makes a semi-circular motion with his front left hoove(in between each stride.)I saw a stretch run where a horse called Collaberation was doing this.I remember a stakes horse called Cutless Reality use to run this way.Yes,it just so happens he is indeed the sire of Collaberation.The head-on I saw it so clearly on was in Pleasanton's 7th race on July 8th of this year. Calracing.com has the head-on.

hmmm////////////

depends which way the foot was going...
a horse with toe-out conformation will exhibit 'winging'--when the foot breaks over on the medial side of the foot and causes it to arc to the inside.
a horse with toe-in conformation will exhibit 'paddling'--where the foot will swing to the ouside as it leaves the ground.
probably dad passed on his front-end defect which is why they have the same action.

Read in a DRF column years ago that Dr. F*ger paddled like a duck.