Real Madrid and Barcelona fans have one of football's biggest rivalries—and even the dogs are at it.
This calm, friendly little dog carries on happily with his business when Cristiano Ronaldo's name is mentioned, but once you say Lionel Messi's, it turns into a snarling, demon dog.
As if to prove the point, the trick is repeated, next time with Sergio Ramos and Sergio Busquets.
Superfan, and super-terrifying.
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