Yup, they're splitting ingredients of the non meat protein items to push the meat items further up the ingredient list to make it look like there's significant amount of meaty proteins in there!
Ingredient Splitting -- The Pet Food Industry's Dirty Little Secret
Dogs have a slightly acidic urine (from eating meat proteins), eating foods like potatoes & peas (veggies & grains) causes high urine pH (alkaline).
Foods That Cause Struvite Crystals | eHow.com