Nearly every weekend we take our sighthounds, Charlie (Greyhound) and Ferguson (Irish Wolfhound), out to a fully enclosed multi-soccer field so they can sprint and play to their hound-hearts' content. If you are not aware, sighthounds aren't the best off-lead in an urban environment. When they see something they want to chase, their other senses (like hearing) become selective at best. A huge field is the best, closest simulation to, say, Ireland a millennium ago, give or take. Today we went with two other Greyhound friends and their human pet. They had a lovely time.