For its Pals Rewards members only, Petco offers a Purina Pro Plan dry dog food or dry cat food item (up to a 6-lb. bag for dogs; up to a 3.5-lb. bag for cats) for free via this printable coupon. (Not a member? Click here to sign up for free.) That's a savings of up to $15 and the first such coupon we've seen from Petco for this dry food. Coupon expires February 15.