Why do greyhounds wear muzzle when racing?

Answer 1

No, greyhounds wear muzzles while racing because they have very thin skin and the competitive nature of a race may excite a dog and cause it to accidentally injure another dog.

Outside of races, some people put muzzles on their greyhounds while they're playing with other greyhounds for the same reason -- to prevent accidental injury of their thin skin.

Answer 2

probably so they don't bite the other dogs racing, yes, but also to protect their long nose if there is a fall and to help determinate which dog's the first if the race is tight.

Answer 3

Some dogs have muzzles because they bite people or bark to much