Plains All American Pipeline has taken steps to further safeguard its payout this year.Dividend yields aren't as high as they used to be. Historically, the S&P 500's dividend yield has averaged about 4%. Today, it's closer to 1%. Many of today's higher-yielding stocks have higher risk profiles. However, that isn't always the case. Plains All American Pipeline (PAA 0.57%) offers a safe dividend currently yielding more than 8%. A safe high-yield dividend stockPlains All American Pipeline is a master limited p ...