A couple of really decent ones on the coupons.com site:

$0.75 off any Muir Glen product is a fantastic one to use at Walmart, where the Muir Glen tomato paste is usually less than a buck.  Print as many of these as you can and use your K-Y overage to prevent any OOP!  More pet food coupons to print and hold.  I’ll check out the Purina WM prices later today.

There is an additional .85 Muir Glen product coupon on the Betty Crocker site, but you must be registered to print.  Two print limit per account.

$5.00 off one package of Purina Pro Plan
Buy two get two free cans of PURINA dog food
Buy two get two free cans of PURINA cat food
$3.00 off Purina Pro Plan Dry Cat Food