Berkshire Hathaway's (NYSE: BRK.A)(NYSE: BRK.B) Warren Buffett prefers to invest in businesses with significant competitive advantages over their peers. That's because such businesses produce reliably growing profits over time. One such company in Berkshire Hathaway's portfolio is the healthcare products distributor McKesson (NYSE: MCK). Buffett's Berkshire owns a 2.3% stake in McKesson, worth nearly $1.2 billion.

This raises the following question: Should dividend growth investors buy the stock right now? Let's dive into McKesson's fundamentals and valuation to decide.

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Source Fool.com