As an owner along with my wife Maureen of a Miniature Horse farm I have many oportunities to photo these wonderful little horses. The foals are usually born between April and June. The best time to photograph the little foals is in the first 2 weeks. You have to remember that the foals average only 20 to 22 inches in height. Most of the time I am down on my knees to catch the action using my 28 to 135 zoom lense. I set the camera on shutter priority and set the 3.5 frames per second to capture the action.
I like to turn the mares and foals out around 10 in the morning to get good lighting as shutter speed is a priority in this type of shooting.You have to learn to anticipate action and be ready for it.It is a joy to watch these little foals run and jump and play. They sure can run and turn on a dime. You usually have about an hour of fast action and then the little ones get tired and take a nap under the mares watchful eyes. There is a lot of luck involved here too as you have to be constantly on the watch for shots like above.
The main thing here is get low on the ground,fast shutter and be able to anticipate what is going to happen.