My house is on a few acres, but I never let ZoE off leash even in the far back, as it's on a main road, and who knows what "could" happen. It's just not worth the risk. I do have two 20ft puppy training leashes and requently take her out back with the two of them tied together, so she feels like she's running free, but in reality she's still attached to me.
My parents house is on a tiny city lot, but it's completely fenced in. That's the only place ZoE is ever off leash.
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