In horse racing, the odds can indeed change after a bet is placed, and they can do so for several reasons. Here’s how and why this happens:
1. **More Bets Being Placed**: As more people place bets on a particular horse, the odds for that horse can change. If a lot of money is bet on a specific horse, the odds will typically shorten (i.e., the payout will be less) because the horse is considered more likely to win.
2. **Changes in the Field**: If a horse is scratched from the race, this can significantly alter the odds. Bettors may adjust their bets accordingly, and the odds for the remaining horses can change as a result.
3. **Market Movement**: Professional bettors and syndicates can influence the odds. If they place large bets, this can cause the odds to shift, as their actions can be interpreted as a sign that they have information indicating a particular horse has a better chance of winning.
4. **Track Conditions**: If the track conditions change (e.g., from fast to sloppy due to weather), this can affect the odds. Some horses perform better on certain types of tracks, so the odds can shift based on these changes.
5. **Jockey Changes**: A change in the jockey riding a horse can also affect the odds. Jockeys with a strong reputation can shorten the odds of a horse they are riding, while less experienced jockeys can lengthen them.
6. **Public Opinion**: Sometimes, the betting public’s perception of a horse can cause the odds to change. If a horse wins a race or performs exceptionally well in workouts or previous races, the public may bet more on that horse, affecting the odds.
It’s important to note that once a bet is placed, the odds at the time of the bet are generally locked in for that particular wager. However, for subsequent bets, the odds will reflect the current market conditions up until post-time. This means that the odds you see when you place a bet may not be the same as the odds you see moments later or on race day.