A day at the beach turned into a wild San Francisco brawl after two men began throwing punches in the sand — with one claiming he was simply walking his dog when the confrontation erupted.

The melee unfolded Tuesday at Crissy Field, on the northern shore of the San Francisco Peninsula, and was caught on video.

A reporter for KRON was at the beach for another story and said he heard yelling coming from the water before spotting the two men wrestling and throwing punches in the sand.

One of the men, James Hidalgo, said he was out walking his dog, Argis, when a man he described as loudly talking approached him.

“He said, ‘Are you calling me a dog?’…

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