The 12 Most Viral Ads of 2015 (So Far)

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Sorry, cats (and goats, for that matter). Dogs are leading the pack as viral advertising of 2015 so far, according to Unruly, with three canine-themed ads among the year's 12 most-shared spots to date—including two of the top four.

Along with the doggie-themed ads—for Purina, Budweiser and Kleenex—it's also been a good year for PSAs going viral. The Ad Council's famous "Love Has No Labels" effort comes in at No. 3 here, while an intriguing social experiment about violence sits at No.

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