If one of your financial goals is to generate some passive income from dividend stocks, it behooves you to know when the companies in your portfolio are healthy, and when they're in deep danger. Likewise, when you're browsing for your next stock purchase, you'll have much better odds of finding a winner if you're using the right guidelines to separate the wheat from the chaff.

Income investors, beware: These three critical warning signs are often displayed by businesses that will soon be struggling to pay their dividends.

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Source Fool.com