From everything I've read and heard while researching the greyhound, they cannot be let off lead. At all. Ever. They will chase anything, including a gum wrapper blowing in the wind, and they usually won't have a reliable recall. To run and chase is hard-wired into their brain, as are various traits for other breeds. Otherwise, a greyhound would make an awesome pet. Clean, short haired and don't shed much, require little exercise copmpared to what most people think they need, and are couch potatoes!