There's about a three feet difference in size between the world's tallest and smallest dogs, according to Guinness World ...

There's about a three feet difference in size between the world's tallest and smallest dogs, according to Guinness World Records.

Zeus, a Great Dane who died in 2014, was the world's tallest dog ever. He reached a whopping 3 feet, six inches, rising three inches taller than Reggie, who holds the record among living dogs.

Zeus, a Great Dane who died in 2014, was the world's tallest dog ever. He reached a whopping 3 feet, six inches, rising three inches taller than Reggie, who holds the record among living dogs.