Purina Pro Plan Shredded Blend Adult Dog Food Review

My wife and I have been giving our two dogs (14 months and 2.5 years) ProPlan ever since they were off puppy chow. They have loved it the entire time. In late December we bought our first bag of the "Shredded Blend". We noticed that both have become very gassy and have been belching alot after they eat. It also seemed that they had lost some weight (which we didn't want because they were both already lean). We took them for their annual checkup yesterday and found that our older dog had dropped down to 71lbs. Last time she was weighed at Haloween she was 88lbs! Our other dog dropped from 38 to 32lbs (not nearly as much but still a bit of a concern). Their activity level has dropped (especially our older one) but we have been trying to increase their diet to regain their original weights. I am so disappointed with Purina, my wife has tried to contact them, but has not heard back. We have changed their food, and will not buy ProPlan ever again.