Horse-racing rules
Can a horse be disqualified after the weigh-in and my bet be reversed?
Direct answer
It depends on the bookmaker's official-result and weigh-in settlement policy; later disqualifications may not affect settled bets.
How to use this answer
A definitive win, loss, void or refund cannot be established from the question alone. Identify the operator, the exact market, the date and the relevant official result, then check the rules that applied to the bet.
Racing bets can have different dead-heat, withdrawal, non-runner and each-way settlement conditions. Confirm the race time, final official result and the operator’s rule that applied when you placed the bet.