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Purring does not always indicate that a cat is happy. Cats will also purr loudly when they are distressed or in pain.

@catfacts There are up to 60 million feral cats in the United States alone.

Foods that should not be given to cats include onions, garlic, green tomatoes, raw potatoes, chocolate, grapes, and raisins. Though milk is not toxic, it can cause an upset stomach and gas. Tylenol and aspirin are extremely toxic to cats, as are many common houseplants. Feeding cats dog food or canned tuna that’s for human consumption can cause malnutrition.