I have an invisible fence at the house (along with solid fencing) which prevents the dogs from running down the driveway. It has worked like new money for more than 10 years. No complaints here.
That said, a worry with invisible fencing (especially in a very big yard) is that someone may dig on a flower bed or install something near the fence line and cut through the wire. If that happens, how do you find where the cut in the wire occurred?
The Invisible Fence folks will charge you about $80 for coming out and tracking down the break, but you can do it yourself by following this "Instructable" which involves using a simple AM radio and a $1.50 part from Radio Shack called an "RF choke" (Radioshack part number 273-102).
With the RD choke hooked into the transmitter, the IF wire should send out a signal you can pick up on the AM radio at about 600 kHz (60 on your AM dial). See the link for a step-by-step guide.
Want to save money on Invisible Fence replacement batteries? There's an "Instructable" on that too.
My hot tip on button batteries of any type (including for locator collars for your working terriers) is to order them through E-Bay where you will pay a fraction of the cost at your local store.
I order my locator button batteries directly from China, and pay about 15 cents apiece (including shipping) as compared to about $2 apiece at Home Depot or Radio Shack.
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