Would A Greyhound Be A Good Option For Me?

I would love to adopt a ex racing greyhound since I am so against the sport, and I think they are beautiful dogs. I have previously owned two small breed dogs, live in a small house but would take it on two long walks or runs per day plus games like fetch.. does anyone here have experience with them? Are they smart, easy to train dogs? Ok with cats? If not I will adopt a mix from the shelter