Income-seeking investors looking for ultra-high-yield dividend stocks can find what they're looking for in the healthcare and finance sectors. Walgreens Boots Alliance (WBA 2.14%) and PennantPark Floating Rate Capital (PFLT -0.28%) offer yields above 10% at recent prices.Before opening your brokerage application to buy these stocks, it's important to remember dividend yields usually don't climb this high unless investors are worried about the underlying businesses.Here's a quick look at what's been pushing ...