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Ms O'Connor said the attention-grabbing trick helped build calm and confidence in both horse and rider.
"It's about making them spook-free, so they're bomb-proof when something goes off."
Her equine companion of 13 years won best farm hack.
"He helps me with calving. Del Boy's pretty chill. Basically he'll do anything for food."
More than 30 attended the A&P show practice event, which was forced under cover by rain.
Convener Heather Dudfield said the weather had not dampened spirits, however.
"Hopefully this bodes well for show day [November 30]."