Electronic pet fencing waste of money

Don't waste your money on buying an electronic pet fencing unit that includes the fencing unit and the dog color. It's a pain to get it to work. After spending so much time and money over and over to fix the stuff, etc...it's still not working properly. After spending at least R2500 on this system, the dogs still chewed the water system, because it doesn't work most of the time. So please don't waste your money!!!