I want to get out more and shoot some more halter classes myself.
Not too bad when they are standing still ... but when the handler is out in the ring (and sometimes indoor arena lighting is really poor as well) working the horse ... trying to get "that" perfect motion shot is not easy.
If I was doing it professionally ... I'd be getting a body that shoots high ISO well ... and the fastest lens possible ... usually at a longer focal length.
I have only really had a chance to shoot outdoors on a bright day ... luckily.
Panning and getting the right shutter speed is fun as well ... I still haven't mastered this yet ... I need more practice.
In those above images I was only using my cheapy Pentax FA-J 75-300mm lens ... one of the worst available really ... and I was only a newbie at the time.