Sign up for the Purina ONE 28 Day Challenge and you'll get a coupon via US Mail for a FREE bag of Purina ONE dog food! Got a cat? There's a challenge for that one, too, that will get you a FREE bag of Purina ONE cat food.
After you register, expect to receive your coupon(s) within two to four weeks. There is a limit of one coupon per individual, household, or email address.