A smaller run, that can be electrified, would at least cut down on the anxiety level when there is no one to monitor the acreage/chooks. Whatever other fencing you can put up to limit access is good as well.
I had good luck, a few years ago, when having some dog issues with some folks up the...
They've apologized three times already (did they pay for the chooks killed)? That you called the pound, on this fourth instance, is more than sporting of you. Do they attempt to fence their dogs? Do you have any fencing up to protect your chooks?
I'd probably have to advise investing in some...