Do greyhounds race with a muzzle?

Answer 1

Yes, it i compulsory for a greyhound to wear a "racing muzzle", these are wire and light as opposed to plastic "box muzzles"

Answer:

Yes, Greyhounds race with muzzles on, not to keep them from fighting, or "going after" one another, but to identify which greyhound won the race.

If you have ever seen the end of a race, you can often have a group of greyhounds at the front, and can be difficult to determine just who won the race. The muzzles help with identifying which "nose" crossed the finish line first.

It also helps protect their long noses from injuries in case they fall.