FREE Purina Dog or Cat Food OR Save $3 This post may contain affiliate links. Please see the full disclosure policy here. Posted on August 14, 2010 Written by Mary Leave a Comment PetSmart is, offering PetPerks members a hot printable coupon for a FREE 6oz. pouch of Purina Pro Plan brand Dog or Cat Food. Simply log in here to access the coupon. Thanks Coupon Pro!