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
This undated image shows Rocko, an enormous Great Dane in Sparks, Nevada that may be the tallest living dog in the world. (KGO-TV)