Neil, sorry to hear about all this. I'll cut right to the chase -- the solution is to put up a nice, tall electrified fence. Either that, or get a good spry outside dog or two that can and will patrol the area.
* not an 'invisible' fence
* not spraying the perimeter with human urine
*or spreading hair around
* or soap, like Irish spring or such
* or doing the naked chicken dance at midnight to show tunes
* or rotten eggs
* etc, etc, ....
Those things may or may not work, and if so, the effect will be temporary at best.
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