The Walmart Canada coupon portal has a coupon that is newly available, valid on Iams dog food. This coupon is for $5 off the purchase of any one bag of Iams dry dog food 4.2kg – 18.2kg, and you can either print the coupon, or request that it be mailed to you.
As far as pricing goes, it is usually the best value to pick up the smallest bag with the coupon. I don’t see the 4.2kg bags on the Walmart Canada website, however, the smallest bags shown online are 6.8kg for $21.98. Purchasing this size bag with the coupon will save you nearly a quarter of the cost, and more if you are able to price match this size bag for less with an ad from another retailer.