The problem with farm animal fences is that they only pulse about once per second, which is plenty of time for a dog to get through or over without getting bit. But if it's an older model, you may be able to adjust the PRF by simply changing a cap in a CR circuit. I set one up so it pulsed about 4 to 5 times per second. This will also drop the peak voltage (20KV to 25KV) down accordingly though. But I checked mine with a X1000 probe on an oscilloscope and it was still producing a spike of around 5,000V. It was plenty enough to keep the dog, a chook and my daughter, from crossing it. Also, you will need to set up a multi strand system with a dog too. It needs to be high enough to stop them jumping it, and low enough so they can't get under it. (like in the song.. "so high can't get over it, so low can't get under it")
Incidentally she wasn't impressed when she tested out the "in ground" system either. Got her to walk towards the antenna line while holding her fingers on the two probes on one of the collars to see how far before they got the warning beep, then the shock. "It's ok, you'll just hear a beep then you should feel a mild tingle when you get too close" She was a bit wary, but just as she was about to start walking towards the fence, the problem dog, who wasn't wearing one of the collars yet, ran towards the gate. She bolted forwards, forgot about the collar in her hand, and beep beep Zzzaappp.
She let out a string of obscenities as she threw the collar away, calling me all sorts of names you shouldn't hear your daughter call you. I just said to her.. "I guess we should probably put it down to medium for the dogs eh?"
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