An invisible fence serves the purpose of keeping your dog contained on your property. There is no law that states you must have a sign showing that you have the fence and if you did someone would complain about the sign and turn you in anyway. We had an invisible fence up north and dogs would walk by all day, ours would bark at them but he knew to the inch how far he could go without getting zapped. If trained correctly they are great fences and all the neighbors and dog walkers soon know that you have one.
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