The Dow Jones Industrial Average is one of Wall Street's most heavily followed indexes. It's constructed from 30 of the most prominent companies traded on U.S. stock exchanges.

But being a large or important company doesn't mean the sailing is always smooth. Some of the stocks in the Dow Jones have struggled mightily in recent weeks. Companies like Walgreens Boots Alliance (NASDAQ: WBA), Walt Disney (NYSE: DIS), and Nike (NYSE: NKE) fell as much as 17% last month.

Have these three names hit temporary speed bumps, or have these Dow dogs seen their best days? I'll go through them individually and separate the contenders from the pretenders.

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Source Fool.com