Please consider these questions carefully. Greyhounds are house pets and people animals who should be exercised on the lead and allowed off the lead only in enclosed areas. A greyhound is so quick that once allowed to roam free he won't live long if there's traffic anywhere near. A greyhound must never be chained up or left neglected in a yard to be miserable, bored, and lonely. Greyhounds learn quickly, but they need you to teach them where to go to the bathroom, how to climb stairs, stay alone, get along with other pets, adjust to a new diet, etc.
Greyhounds are sensitive creatures who want to please.
They will not respond to a loud voice or threatening manner. Violence will be fatal to your relationship.