As far as ingredients go, Pedigree really doesn't have anything great to offer.

See the ingredient list here. I've put in bold the questionable ingredients.
GROUND YELLOW CORN, MEAT AND BONE MEAL, CORN GLUTEN MEAL, CHICKEN BY-PRODUCT MEAL, ANIMAL FAT (PRESERVED WITH BHA/BHT), WHEAT MILL RUN, NATURAL POULTRY FLAVOR, RICE, WHEAT FLOUR, SALT, POTASSIUM CHLORIDE, CARAMEL COLOR, VEGETABLE OIL (SOURCE OF LINOLEIC ACID), VITAMINS (CHOLINE CHLORIDE, dl-ALPHA TOCOPHEROL ACETATE [SOURCE OF VITAMIN E], L-ASCORBYL-2- POLYPHOSPHATE [SOURCE OF VITAMIN C*], VITAMIN A SUPPLEMENT, THIAMINE MONONITRATE [VITAMIN B1], BIOTIN, d-CALCIUM PANTOTHENATE, RIBOFLAVIN SUPPLEMENT [VITAMIN B2], VITAMIN D3 SUPPLEMENT, VITAMIN B12 SUPPLEMENT), TRACE MINERALS (ZINC SULPHATE, COPPER SULPHATE, POTASSIUM IODIDE).