We had Invisible Fence up north and they were great to work with. When we moved down here, we got a quote from them as well as Dog Watch. DW was quite a bit less, and since our dog (a lab) already knew what those flags meant, there was no need for training from DW. She is doing fine with it. So, it depends on whether the dog is accustomed to it or not.
One thing to be aware of (and this is from personal experience): we use Massey for our lawn service, and they core aerate the lawn once a year (I think). Anyway, they did it and cut the wire in two spots. They reimbursed us for the cost of the wire repair and now have a note in the file to call us ahead of time so we can mark where the wires are.
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