Some pet foods made in states where it's illegal to dump euthanized dogs and cats in landfills may contain small amounts of protein derived from those animals, according to sources in this article. Researchers at the FDA began studying the question after tests in the 1990s revealed traces of pentobarbital in pet foods and concluded that the drug likely came from euthanized cattle, horses and possibly pets. Since then, animal advocates have worked to eliminate the practice of rendering dog and cat carcasses for pet food.

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