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Both my neighbor and uncle have the underground Invisible Fence. The neighbors have a border collie mix that's pretty smart and won't get anywhere near the boundary if he has the collar on regardless if it's working, if they forget to put the collar on (mainly a house dog) then he will wander a little but generally stays in the yard. My uncle has a 200 lb. bull mastiff mix, 150 lb. St. Bernard (still a pup), and some sort of punt-kick little dog. They did have to step up to a bigger collar/shocker for the mastiff but since they have had no problems. FYI, the mastiff is dumb and the little dog is feisty. He probably has a full acre if not a little more fenced in.
Like said above you do have to train the dogs but in all cases it was pretty easy to do.
Two friends have the remote style like the one mentioned above from TSC where you hang the sending unit someplace (garage, house, etc...). You can set the radius of it a certain amount but I'm not sure the limit. Both have had good luck and maybe a little less than an acre in the perimeter....just remember to take the collar off the dog before taking him on a road trip in the car. The biggest limitation to this system is the limit of your boundaries/yard since it's a radius.
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