Saving Cents with Sense has some great deals for your pup. First, Walmart is offering a free sample of Beneful Incredibites here.
Then she has a coupon for Natural Ultramix here which will also link you to her post about free Halo dog food.
Last night while at Target I found big bins of Milkbone treats. They were in a clear plastic container and on clearance for 4.24. My pup is on a diet, so I resisted the great deal to buy her them. Plus, they are the soft kind that they make to look like mini steaks etc, basically the kind all dogs love. The next time you are at Target keep an eye out for them.