Dividend investing is a tried-and-true strategy for generating strong, steady returns in economies both good and bad. But as corporate America's slew of dividend cuts and suspensions over the past few years has demonstrated, it's not enough simply to buy a high yield. You also need to make sure those payouts are sustainable.

Let's examine how Weyerhaeuser (NYSE: WY) stacks up in four critical areas to determine whether it's a dividend dynamo or a disaster in the making.

1. Yield
First and foremost, dividend investors like a large forward yield. But if a yield gets too high, it may reflect investors' doubts about the payout's sustainability. If investors had confidence in the stock, they'd be buying it, driving up the share price and shrinking the yield.

Weyerhaeuser yields 3.8%, considerably higher than the S&P's 1.9%.

2. Payout ratio
The payout ratio might be the most important metric for judging dividend sustainability. It compares the amount of money a company paid out in dividends last year to the earnings it generated. A ratio that's too high -- say, greater than 80% of earnings -- indicates that the company may be stretching to make payouts it can't afford, even when its dividend yield doesn't seem particularly high.

The payout ratio is somewhat less important when evaluating real estate investment trusts like Weyerhaeuser because they are required to pay out a high percentage of their earnings in the form of dividends in order to avoid paying corporate income taxes.

3. Balance sheet
The best dividend payers have the financial fortitude to fund growth and respond to whatever the economy and competitors throw at them. The debt-to-equity ratio is a good measure of a company's total debt burden. We can also look at interest payments as a percentage of interest revenue for a quick way to gauge how comfortably these REITs can afford to make their interest payments.

Let's examine how Weyerhaeuser stacks up next to its peers:

Company

Debt-to-Equity Ratio

Interest Coverage Ratio

Weyerhaeuser

95%

1 time

Plum Creek Timber (NYSE: PCL)

202%

2 times

International Paper (NYSE: IP)

107%

4 times

Rock-Tenn (NYSE: RKT)

98%

6 times

Source: Capital IQ, a division of Standard & Poor's.

Forestry is a fairly capital-intensive but reliable industry, which explains why these companies are willing and able to carry fairly significant debt burdens. Still, Weyerhaeuser's interest coverage ratio is a bit low.

4. Growth
A large dividend is nice; a large growing dividend is even better. To support a growing dividend, we also want to see earnings growth.

Over the past five years, Weyerhaeuser's earnings per share have increased at an annual rate of 6%, while dividends per share declined at a 28% rate.

The Foolish bottom line
Weyerhaeuser has a generous dividend yield. Like other forestry and paper-related companies, it carries a fairly significant debt burden, so earnings reliability is important. Dividend investors will want to keep an eye on the company's operating earnings to ensure that they remain reliable enough to make those large interest payments and still have leftovers for shareholders.

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