I would not let either of my two off leash somewhere that is not fenced in. I don't trust them. Loki would run to bark at another dog, Sammy would go after a bird, squirrel or kid (to lick!) I can't control them when they get into their little crazes, I think it's a terrier thing. I'm not against off-leash dogs - my next door neighbor's labs are always off leash and they are wonderful dogs. Mine come when called, mostly, and we've done obedience and they do listen in the house but one distraction and BOOM they are gone. Luckily only to the end of a flexi.
Terriers are just not as easy to control off leash as labs and other dogs. Squirrels are 100 times more interesting than even a freshly cooked steak to Sam.
