Most commercial pet foods are garbage: many dog foods claim to be "100% nutritionally complete and balanced." This claim legally can be made and printed on commercial products based on information studies using isolated nutrients and not whole foods. These tests ignore important nutritional issues and give you a false sense of knowledge and security. Many commercial dog foods are made from materials unusable or less desirable for human consumption. Some dog food contains at least six deadly chemicals that have been banned from human foods because they may cause different kind of cancer and severe allergic reactions.
Buying foods labeled as chemical and preservative free doesn't make your dog safe: it's just another lie. Dog foods marked as chemical and preservative free usually contain both! An analysis of several dog food found synthetic antioxidants in all samples.
And now prepare to be horrified. Ask yourself: is my dog a cannibal? If you feed your dog with commercial dog food the answer is YES! Your dog's food could contain dead pets, mostly cats and dogs! For example, the city of Los Angeles sends some two hundreds tons of euthanized cats and dogs to a rendering plant every month.
If you continue to feed your dog commercial dog food, death by disease is practically guaranteed! You must find an alternative and it doesn't have to mean spending more money. It's been documented that dogs fed exclusively on specific, well-balanced, calorie-controlled, home-made recipes live up to 8.3 years longer.