For persistent offenders I would take the dog off them and take it to the RSPB....sorry i meant Dogs Home and give it to a family who will "own " it properly.
Im afriad that in Liberal Britain we are far too soft on some folk.
I think the RSPB are a bit busy protecting birds to get involved with disputes about dogs.
If you can keep your head, while those around you are losing theirs, you may not have grasped the seriousness of the situation.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.