Some interesting facts about the greyhound breed.

A Racing Breed

Greyhounds are said to date back 4000 years. They are seen in early cave drawings and are even mentioned in the Bible.
They can reach 45 mph.
Greyhounds weigh 60-70 pounds with a fat content of about 16%, compared with 25% in other dogs.
Greyhounds can see clearly for a distance of half a mile
A greyhounds has a larger heart and lungs and more red blood cells than other canine breeds.
Racing greyhounds spend 80% of their time in the air, as close to "flight" as a land animal can get.
Celebrity owners included Babe Ruth, Frank Sinatra, and Ed Sullivan.
Source: WSJ research