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

While the average Great Dane reaches an impressive 32-inches tall, Reggie stands at 39.6-inches, making him the tallest living dog. However, even Reggie would looks small next to the tallest dog ever ...

Incredibly, the largest Great Dane ever was named Zeus, and he reached 44 inches in height at his shoulders. When standing up, Zeus measures 7ft 4in, which is taller than all but the tallest ...

However, even Reggie would looks small next to the tallest dog ever - Zeus, a fellow Great Dane, who measured 1.118 m (3ft 8 in) in 2011! Meanwhile Pearl measures 9.14 cm (3.59 in ...

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.