During the first 40 days of pregnancy, mares are especially susceptible to early embryonic death loss. This can be caused by many factors, which is why providing a low-stress, healthy environment becomes all the more important. Continue normal horse care—deworming, proper diet and exercise, and vaccinations. Pregnancy may be confirmed within the first 30 days and should be reconfirmed at 90 days by your veterinarian prior to starting vaccination protocol (rhinopenumonitis vaccine).

Your veterinarian may recommend an ultrasound at 15 days to detect twins. If twins are present, your veterinarian will recommend eliminating one of the twins due to the high-risk that twin fetuses pose to each other. By eliminating one twin, the remaining twin is more likely to develop normally in a situation that, if left up to nature, is highly unlikely to have both twins survive and be healthy.