It's book #8 in the Sandy Lanes Stables Series.
Alex's sister Kate cannot believe what he's done. Alex thought he was solving lots of problems buying a pony at local auction. So he's in for a shock when he realizes he is now the owner of Puzzle, a filthy, thin and abused pony. But worse is to come, for Puzzle is in such a state, she may have to be put down. More fun and frolics will be offered from the "Sandy Lane Stables" series, adored by horse-lovers everywhere.
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