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We repace the batteries on the collars the first of every other month when we give Heartguard and Frontline. It probably wouldn't matter if we did or not because once they know the bondaries, they never leave. But if you have a stubborn breed, battery replacement would be important at least every 6wks or so. They get weak and go dead in about 8wks.
I used those hog panels? Our dogs have about 1/4 acre maybe? Included is a shed sized dog house. Not the prettiest looking area but it keeps them in and gives them lots of room to do their thing. I will try to get pics of it today.