More photos here: www.townchiro.com/Greyhound_Run_13Nov2010/: "The key to the speed of a Greyhound can be found in it's light but muscular build, largest heart, and highest percentage of fast-twitch muscle of any breed, the double suspension gallop and the extreme flexibility of the spine. "Double suspension rotary gallop" describes the fastest running gait of the Greyhound in which all four feet are free from the ground in two phases, contracted and extended, during each full stride."
