An "unfenced yard" refers to a yard or outdoor space that does not have a barrier or enclosure around it. It means that the area is not protected or kept separate from the surrounding environment. Full definition
Exercise and elimination will be: Exercise pen runChain or TrolleyLeadTotally enclosed fenced yardPartially fencedElectronic / Radio fenceLoose in unfenced yard (midwestbtrescue.org)
Several years back in Tulsa, there was a small boy who wandered into the unfenced yard of a blue heeler who was tied out on a chain. (tulsapetsmagazine.com)
There are a lot of systems that are cheap, easy to install, and will prevent your pet from escaping an unfenced yard. (puppy-training-solutions.com)