Dog food contains many of the same ingredients as human food, like chicken, meat, and vegetables, but it may also contain animal by-products — for example, ground-up animal bones or organs like the intestines.The best advice is to keep dog food for dogs and human food for humans!lthough most dog food contains the same basic components that are in people food — protein, carbohydrates and fats — the proportions of these ingredients are different than in human food and can be harmful if ingested in significant quantities or for prolonged periods of time.