Do you want to 'capture the moment'? Or to have it represent 'the spirit' of the horse/rider.
Does that make any sense?
Our latest dog, and Sparky the blue heeler before her never bit the horses heels. Or the children. When herding cows and other dogs, well that is another matter!
Try training. Now is the time to start your beautiful puppy, Mommadooo3. I have started our English setter on comand by whistles too and she has responded very well, she does have Sally to watch though. My first whistles were to train them to come immedietly I called. There is another for food, and a different one if I have someone here and need them for protection. When a cow got lose into our yard, Sally did great in blocking of an escape route! Good luck and be blessed with many hours of patience! ; D