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Davis said she received Zeus as a gift from her brother when the canine was only 8 months old.
"He's been a big dog since we got him, even for a puppy. He had huge paws," Davis told Guinness World Records.
Davis said relatives suggested Zeus could be the world's tallest dog during a recent family gathering.
"We didn't think that was even a possibility but once we measured him, we realized he probably was," she said. "This has been a whirlwind and unexpected. We never thought we would own the largest living dog."
The tallest dog ever, coincidentally also a Great Dane named Zeus, stood at 3 feet and 8 inches tall. He died in 2014.