Prevention of Equine Cruelty Act of 2009 - Amends the federal criminal code to impose a fine and/or prison term of up to three years for possessing, shipping, transporting, purchasing, selling, delivering, or receiving any horse, horse flesh, or carcass with the intent that it be used for human consumption. Reduces the prison term to one year if the offense involves less than five horses or less than 2,000 pounds of horse flesh or carcass and the offender has no prior conviction for this offense.