SPARKS, Nev. (KGO) -- An enormous dog in Sparks, Nevada named "Rocko" may be the world's tallest living dog. The family is now trying to get him into the Guinness Book of World Records.
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PHOTOS: Great Dane 'Rocko' may be world's tallest living dog
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This undated image shows Rocko, an enormous Great Dane in Sparks, Nevada that may be the tallest living dog in the world.