Twenty-two show horses were in a barn that caught fire on Green Valley Road near Auburn, Wash., according to South King Fire and Rescue.
A resident spotted the fire, called 911 and opened the barn doors to release the horses.
Firefighters put the fire out within 30 minutes.
One horse was taken to an emergency veterinarian to be treated for smoke inhalation and burns on its nose.
The fire caused around $200,000 in damage and was accidental. Investigators haven't determined a cause.
All the horses were rounded up and brought back to the property.
No people were reportedly injured.