I had to buy the stuborn dog collar. A little more voltage. The first collar he would lay right on the fence and not bother him at all. The second collar he would yelp good when he got hit. It also had the low batt. light. I think Lowes carries that sytem. I think they work great as long as you take the time to train your dog. If you put it in and just think he will figure it out. It will be a waist of money.
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