I rent a cottage on an arable farm, with a large garden but the fencing is completely open.
There are many rabbits/ hares/ pheasants/ partridges sometimes even a deer pass close by or even directly in the garden.
I would love to home a smallish older dog, based on the dogs of friends I've met who I could see would fit our lifestyle and also of course would be nice to give a home to an older dog that others might not want. We used to have staffies many years ago but whilst they were besotted with their humans they couldn't help themselves and chased any creature that moved. So I know they would never have been able to live in a house like this.
But do all dogs require a secure garden? Are there any breeds who preferring lazing in a garden with no desire to run free across fields?