Q&A: Feeding fizzy horses

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Q: I have a six-year-old 15.1hh part-Trakehner X show pony mare. She’s quite spooky out hacking and when I try to school her, she stops and turns herself inside out, spinning round. Her antics are beginning to frighten me.I try to ride her every day, but sometimes I don’t have time to ride for long. I don’t turn her out very often as she doesn’t like it and waits by the gate to come in again. She is given two hard feeds a day. Can you help?