Here's why:
* Breed Purpose: Greyhounds were bred for coursing, a sport that requires immense speed to chase down rabbits. Italian Greyhounds, on the other hand, were companion dogs and weren't bred for speed.
* Build: Greyhounds have a streamlined, athletic build with long legs and a deep chest, which are all optimized for speed. Italian Greyhounds are much smaller and have a more slender build.
* Top Speed: A greyhound can reach speeds of up to 45 mph, while an Italian Greyhound can only reach speeds of around 25 mph.
Although Italian Greyhounds are still quick and agile, their speed is no match for the greyhound's remarkable speed.