Couple's Great Dane may be tallest living dog

Rocko, a Great Dane from Nevada, is about 7 feet tall and could be the world's tallest living dog. (KGO-TV )

A couple in Nevada thinks their dog may be part horse.

Rocko stands at 40 inches from paw to shoulder and is about 7-feet tall when on his hind legs.

Owners say the 160-pound Great Dane thinks he's a Chihuahua. The family is now trying to get him into the Guinness Book of World Records.
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