My Great Aunt and Cousins have used them with very good out come and have since taken the collars off the dogs and they still respect the boundaries. They live in the country though and I am not sure where you live but I would think in a city I would just invest in either a permanent fence or some sort of kennel or run.
I have fencing but live in the country and do let me dog run around on our two acres and with Tuesday my standard she won't go far with out me and the other have all had OD training so they know how far they can go and when to come back.
Anyway good luck!
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