But, if your foal's respiratory rate is higher than it should be for no reason, have your veterinarian examine the foal. Being able to detect subtle changes in your foal's breathing requires skill. Watch for flaring of the nostrils and increased movement of the rib cage when breathing. If your foal is displaying these signs while resting, there is a problem. So, keep a close eye on your foal, and if you notice an increased respiratory rate or even if you are suspicious, then have your veterinarian examine your foal.
Horses have several defense mechanisms in their lungs to help prevent infection.
The particles usually are swallowed. Remember, foals have no other defense mechanisms at this age to fight infection. These foals can develop pneumonia from an infection that originally occurred in another part of their body, such as diarrhea or an umbilical infection. The bacteria are inhaled quite inconspicuously and implant themselves in the respiratory tract within the lungs. If there are low numbers of bacteria inhaled, the foal's body can destroy the bacteria and head off infection.