Q&A: Help! My horse hates tractors

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Q: I have bought a seven-year-old cob that had previously been used for driving and hunting. He was sold because he had become tractor shy, and his owners felt he was no longer safe to pull a carriage.

When I ride him, he seems happy to accept the tractors driving around at home, but will panic and bolt if he meets one when we are out hacking. This is making me lose my nerve.