When a horse gets disqualified, the short answer is you will lose your stake. However, if your bookie pays first past the post, you can end up winning big even if your horse got disqualified. There are, however, a number of rules that need to be followed in order for your bet to qualify. Horses that, for example, have been disqualified because they failed to weigh-in correctly, or because they have taken the wrong course, do not qualify for first past the post.