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Cheetos contain the following ingredients:
Enriched Corn Meal (Corn Meal, Ferrous Sulfate, Niacin, Thiamin Monoitrate, Riboflavin, and Frolic Acid), Vegetable Oil (Contains one or more of the following: corn, soybean, or sunflower oil), Whey, Salt, Cheddar Cheese, (Cultured Milk, Salt, Enzymes). Partially Hydrogenated Soybean Oil, Maltodextrin, Disodium Phosphate, Sour Cream (Cultured Cream, Nonfat Milk), Artificial Flavor, Monosodium Glutmate, Lactic Acid, Artificial Colors (Including Yellow 6), and Citric Acid. Contains Milk Ingredients.
for a list of their products that contain animal ingredients: