Immunity from Claims Related to Donated Horses Act of 2007 - Requires each humane organization that receives any horse or mule to hold the Department of Homeland Security (DHS), including U.S. Customs and Border Protection, harmless from any demand, suit, action, or claim arising from or related to the government's donation of the horse or mule, including damages to the organization's property and any personal injury, disability, or death of any officer, employee, or agent.
Authorizes horses and mules belonging to the federal government that have become unfit for service to be adopted by the DHS agents who have worked with such horse or mule.