Horse Health · Vaccines
Vaccinating a horse exposes it to a small, controlled portion of a disease-causing virus or bacteria so its immune system learns to fight that disease. A vaccinated horse isn't guaranteed immunity, but if it does contract the disease, the case is typically milder and recovery odds are much better. Work with your veterinarian to decide which of the following your horse needs based on region, age, and exposure risk.
Pregnant mares are often vaccinated on a separate schedule from other horses, so their first milk (colostrum) passes protective antibodies on to the foal.