Chinchilla
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Theoretically yes. It's called placebo by proxy and is basically where someone's behaviour is affected by the belief of others that their behaviour will now change. (I think, not sure if I've worded that brilliantly though...)If the OP was the one taking the placebo herself, then yes it could still work (especially if it was an injection as apparently that has a greater placebo effect than a pill), but she's thinking about giving it to the horse, so one step removed. Would that still work?
Part of me acknowledges I just need to be a bit more patient, but it's frustrating because when I bought my mare home she was not too much horse for me, but now post-accident she is, even though it's not her that's changed or done anything wrong. :-(