Follow the instructions of the local authorities and emergency services first. This tool connects people of goodwill; it does not replace the authorities.
There's nothing available right now, but things change fast: yards declare their places all the time. Leave your number, and you'll be notified as soon as something matches.
Don't wait for this text to act. Keep searching, call, ask around. This alert is a safety net, not a solution. If your horses are threatened right now, call the emergency services.