Greyhounds are a race similar to the racetrack. The big difference is that greyhounds are knowledgeable in individual countries but they are very successful here.
These countries are England, America, Ireland, Australia, Spain, China and Mexico. In these countries greyhounds are a very popular sport and there are big betting companies on this sport. In many of these countries, these businesses are very much in support of their country's economy.
More on Infobeto's homepage:
Greyhounds and how to bet.