First, I would suggest you start this as a new topic because few people will look at it here.
Second, stop feeding Iams. It's full of fillers and other crap and is not good for your dog. There are lots of other better quality foods that will solve the poop problem. Consider Wellness, Solid Gold, or other premiums foods. You spent more per bag, but feed less and get less poop.
Prevent a litter
Fix your critter