Yes! most pet food causes all those skin rashes and flaky skin. You can usually clear these up with a natural, healthy diet.
Explanation
Do you know about dog nutrition? Find out!
Dogs should eat mostly meat; vegetables are good and add fiber to the diet.
Although none are good, Xylitol is the most dangerous: it causes hypoglycemia [i.e., if a dog eats sugar-free gum/candy.] People are not affected by xylitol in the same way as dogs, but beware when YOU eat artificial sweeteners too. They can be carcinogenic (cancer causing)...
Iams and Purina, and many others contain harmful toxins and even bad meat like road kill! Cooked meals drain food of vitamins, and grain is not good for dogs. A natural raw diet is best, and has all the nutrients your dog needs! Vets are not educated (much)in nutrition, and don't always know much about what to give. Table scraps can contain things like chocolate, which is harmful.
Meats, liver and dairy are all high in B12.
BHA (Butylated hydroxyanisole) and BHT (butylated hydroxytoluene) can cause severe damage to organs. Propylene glycol is a weed killer and rubber stabilizer and has almost an identical molecular structure to ethylene glycol (used in antifreeze). Ethoxyquin is also very dangerous. It can cause liver failure and is thought to be carcinogenic. Mixed tocopherols are the best; they are a form of vitamin E and are more natural.
Chlorella is a type of single celled kelp. It is very healthy because it is high in protein and other essential nutrients. When dried, it is about 45% protein, 20% fat, 20% carbohydrate, 5% fiber, and 10% minerals and vitamins. It also aids in the detoxification of the body.
Hip dysplasia, bone problems, & rapid growth may result from feeding a large breed pup food formulated for puppies. A raw, grain free diet is best, but a healthy dry adult food is okay. Like mentioned in the last question, vets are not nutritionists and do not always sell good food.